Philosophers 18th century
Bernard Bolzano, full name Bernard Placidus Johann Nepomuk Bolzano, was an Italian-born Czech scientist, mathematician, logician, philosopher and theologian.
Bolzano graduated from the University of Prague and was immediately appointed professor of philosophy and religion at the university. Within a few years, however, Bolzano had already shown himself to be a free thinker with his teachings on the social costs of militarism and the needlessness of war. He called for a complete reform of the educational, social, and economic systems that would direct the nation's interests toward peace rather than armed conflict between states. In 1819, Bolzano was expelled from the university for his beliefs and thereafter turned his full attention to works on social, religious, philosophical, and mathematical issues.
Bolzano held advanced views on logic, mathematical quantities, limits, and continuity. He is the author of the first rigorous theory of real numbers and one of the founders of set theory. In his studies of the physical aspects of force, space, and time, he proposed theories opposed to those advanced by the German philosopher Immanuel Kant. His contributions to logic, in particular, established his reputation as the greatest logician of his time. Much of his work remained unpublished during his lifetime and was not widely disseminated until the late nineteenth and early twentieth centuries, when a number of his conclusions were reached independently.
Bolzano was multi-talented in various fields of science to which he made significant contributions. His published works include The Binomial Theorem (1816), A Purely Analytic Proof (1817), The Functional Model and the Scientific Model (1834), An Attempt at a New Statement of Logic (1837), and The Paradoxes of Infinity (1851).
Among other things, Bolzano was also a great philanthropist. Together with his friends and students, he supported the activities of almshouses, homes for the blind, loan banks for the working class, libraries, and elementary schools in rural areas.
Mathurin Jacques Brisson was a French zoologist, ornithologist, naturalist and physicist, a member of the Academy of Sciences.
He is known for his published works in natural history: Le Règne animal ("The Kingdom of Animals", 1756) and Ornithologie ("Ornithology", 1760), in which he described 1,500 species of birds grouped into 115 genera, twenty-six orders, and two classes. Brisson was one of the first to come close to the concept of "type" in zoology, although he does not use the term, but his classification was used for about 100 years. He translated a number of important books on zoology for his time into French.
Brisson's works in physics are related to the measurement of specific gravity of various bodies, the study of gases and refraction of light, mirrors, magnetism, atmospheric electricity, and barometers.
John Cartwright was an English naval officer, Nottinghamshire militia major and prominent campaigner for parliamentary reform. He subsequently became known as the Father of Reform. His younger brother Edmund Cartwright became famous as the inventor of the power loom.
Étienne Chauvin was a French Protestant theologian and philosopher.
Chauvin's philosophy and worldview were entirely Cartesian. After his expulsion from Nîmes, Étienne Chauvin withdrew to Rotterdam, where he preached for several years in the Walloon Church. He was succeeded as professor of Baille at Rotterdam. In 1695 the Elector of Brandenburg appointed him pastor and professor of philosophy, and afterward inspector of the French college at Berlin.
Etienne Chauvin's major work is Lexicon Rationale, sive Thesaurus Philosophicus (1692). He also wrote Theses on the Knowledge of God (1662) and published the New Journal of Scholars (1694-1698).
Romeyn de Hooghe was a Dutch painter, sculptor, engraver and caricaturist of the late Baroque period, writer and philosopher.
Hooghe became famous for his political caricatures of King Louis XIV of France and propaganda pamphlets in support of William of Orange. He portrayed the war against the French monarch and his allies as a struggle between freedom and religious despotism.
Romeyn de Hooghe was a superb engraver and created over 3,500 engravings during his lifetime. His most important work is Hieroglyphica of Merkbeelden der oude volkeren (Hieroglyphics or Symbols of the Ancient Peoples), where he appeared not only as a consummate master of engraving, but also as a historian, talented writer and philosopher. This book has long been regarded in Europe as one of the most authoritative sources on classical mythology. It contains 64 engravings illustrating all stages of the narrative of myths, ancient cults and beliefs, and the interpretation of scripture, a guide to medieval Europe.
Romeyn de Hooghe also illustrated books and painted large panels. During his lifetime he was widely recognized as a painter and sculptor not only in his own country but also in other European countries.
Nicolas-Louis De la Caille was a French astronomer, abbot and educator.
He studied philosophy and theology, became an abbot, but the craving for science overpowered everything, and he studied astronomy on his own. In 1736, la Caille received a place at the Paris Observatory, in 1739 was appointed professor of mathematics at Mazarini-College in Paris and built his own observatory, where he conducted astronomical observations. In 1741 Lacaille was admitted to the Académie des Sciences.
La Caille was an outstanding astronomer: he observed more than 10,000 stars in the Southern Hemisphere and named 14 of the 88 constellations. In 1752, he made an astronomical expedition to the Cape of Good Hope, where he built an observatory and conducted a huge series of observations, including the discovery and cataloging of 42 nebulae. These studies led to la Caille being called "the father of southern astronomy," and his observations from South Africa of the Moon, Venus, and Mars, combined with similar observations already made in the Northern Hemisphere, led to the calculation of more accurate values for the distances to these bodies.
On his return to Paris two years later, in 1754, he resumed his post and taught at the school of Mazarin, continuing his work at the observatory of the College of Mazarini. Among his pupils was the great chemist Antoine Lavoisier. La Caille was a foreign honorary member of the St. Petersburg Academy of Sciences and a member of the Royal Society of London. His Coelum Australe Stelliferum ("Star Catalog of the Southern Sky") was published in 1763.
Lewis David de Schweinitz (also Ludwig David von Schweinitz), born on February 13, 1780, in Bethlehem, Pennsylvania, was a German-American botanist and mycologist. His parents, Hans Christian Alexander and Dorothea Elizabeth von Watteville von Schweinitz, were instrumental in the administration of the Moravian Church in America. Following his early education in Bethlehem, Schweinitz was sent to Germany in 1798 to continue his academic pursuits.
In Germany, Schweinitz enrolled in the Moravian Theological Seminary at Niesky in Silesia. It was there that he met Professor Albertini, who shared his interest in botany. Schweinitz's focus on the study of fungi earned him the title "Father of North American Mycology." His contributions to the field were significant, as he was the first American to concentrate his botanical efforts specifically on fungi.
Among his many accomplishments, Schweinitz produced extensive mycological illustrations and published works on the subject. His manuscripts and watercolor paintings of fungi served as reference materials in the development of his Conspectus, a compendium of his findings and classifications. The impact of his work was so considerable that several taxa were named in his honor, highlighting his legacy in the world of botany and mycology.
Schweinitz passed away on February 8, 1834, but his legacy endures through his scientific contributions and the respect he garnered internationally as a botanist. His life and work continue to be celebrated and studied by those in the field, and his illustrations and findings remain a significant part of mycological history.
Friedrich Gottlob Hayne was a German botanist, taxonomist, pharmacist and professor.
After many years of teaching, he was appointed Professor of Pharmaceutical Botany in 1828. In addition to his lecturing duties he led many botanical excursions. He was known for using precise terminology in his plant descriptions.
David Hume, birth name David Home, was an 18th-century Scottish Enlightenment philosopher, historian, economist, librarian, and essayist.
He is best known for his philosophical empiricism and skepticism. Hume saw philosophy as an inductive, experimental science of human nature. Taking as his model the scientific method of the English physicist Isaac Newton and drawing on the epistemology of the English philosopher John Locke, Hume tried to describe how reason works in obtaining what is called knowledge. He concluded that no theory of reality is possible; there can be no knowledge of anything beyond experience. Despite the enduring influence of his theory of knowledge, Hume seems to have considered himself primarily a moralist.
Hume was one of the particularly significant figures of his century--as a writer, historian, economist, and philosopher he made great strides forward and his achievements are still highly valued in human culture today.
Gottfried Wilhelm Leibniz was a German philosopher and a prominent polymath in many fields of science.
Leibniz was a universal genius; he showed his talents in logic, mathematics, mechanics, physics, law, history, diplomacy, and linguistics, and in each of the disciplines he has serious scientific achievements. As a philosopher, he was a leading exponent of 17th-century rationalism and idealism.
Leibniz was a tireless worker and the greatest scholar of his time. In the fate of Leibniz, among other things, there is one interesting page: in 1697, he accidentally met the Russian Tsar Peter I during his trip to Europe. Their further meetings led to the realization of several grandiose projects in Russia, one of which was the establishment of the Academy of Sciences in St. Petersburg.
Gottfried Wilhelm Leibniz was also the founder and first president of the Berlin Academy of Sciences and a member of the Royal Society of London.
Anne-Louise-Germaine Necker, Baroness of Staël-Holstein, known as Madame de Staël, was a French writer, literary theorist, and publicist.
She was born into a Swiss family where her father was a banker and then finance minister to King Louis XVI, and her mother ran a brilliant literary and political salon in Paris where Voltaire, Diderot, and Hume frequented. Young Necker received a brilliant education, she absorbed the intellectual environment with great curiosity, becoming a witty and well-read conversationalist.
In 1786, she married the Swedish ambassador to Paris, Baron Eric de Staël-Holstein. It was a marriage of convenience, which ended in 1797 formal divorce.
Madame de Staël became known not only for her stunning and versatile works, but also for her enormous influence on the intellectual climate of that 19th century. During her lifetime she was known as a novelist, but she became much more famous as a political philosopher, literary critic, and theorist of Romanticism. Madame de Staël was an implacable opponent of Napoleon I and traveled around Europe for a decade during his reign from 1803. In 1810, the writer published one of her most famous and influential works, On Germany. She returned to Paris in 1814, after the fall of Napoleon, and wrote "Reflections on the Principal Events of the French Revolution."
In her travels, Madame de Staël met many politicians, artists and writers and was known for her cosmopolitanism and feminism. Madame de Staël epitomized the European culture of her time, combining ideas from neoclassicism to romanticism in her glittering salon for leading intellectuals.
Giovanni Vincenzo Petrini was an Italian priest and theologian, philosopher, mathematician, and expert in mineralogy.
Along with Scipio Breislacus, Petrini was one of the founders of Italian volcanology. He taught philosophy and mathematics, theology, but specialized in mineralogy and created the Mineralogical Cabinet in Nazareth. This museum was famous in Europe and was visited, among others, by Emperor Joseph II, who gave him rare specimens from the lands of the Empire and especially from Hungary.
Giovanni Petrini was the author of the catalog Gabinetto mineralogico del Collegio Nazareno ("The Mineralogical Cabinet of the Nazarene Collegium, described by external features and distributed by component parts" (Rome, 1791-1792). The specimens in it are classified according to a standard structure: salts, earths, bitumens, combustibles, and metals. There is also a section on gemstones.
Adam Smith was a Scottish economist and philosopher, one of the founders of economic theory as a science.
After graduating from Balliol College at Oxford University, Smith in 1751 became Professor of Logic and then Professor of Moral Philosophy at the University of Glasgow. And at the same time worked on publishing some of his lectures. His book The Theory of Moral Sentiments was published in 1759. As a philosopher, he wrote on a wide range of subjects: moral philosophy, jurisprudence, rhetoric and literature, and the history of science. He was one of the leading figures of the Scottish Enlightenment. Adam Smith also studied the social forces that give rise to competition, trade, and markets. On his trip to France, he met François Kenet and the Physiocrats.
In late 1763, Smith was given the position of tutor to the young Duke of Buccleugh and resigned his professorship. He began to socialize extensively with the intellectuals of his day, aristocrats and scholars, members of the government and representatives of big commerce, and gradually moved from philosophy to economics.
Adam Smith published his most important work, An Inquiry into the Nature and Causes of the Wealth of Nations (abbreviated as The Wealth of Nations), in 1776. It was the first major exposition of the theory of free trade, where the author advocates individual liberty and the accumulation of wealth, while strongly advocating moral justice and duty to society. He describes a system of natural liberty and justice that seeks to raise the standard of living of the general population by equating higher wages with a healthier and more productive labor force. He proves his belief that the limits to growth are political, not economic, and outlines the principles that should guide lawmakers. Smith also lays out a history of economic theory, a historical analysis of the wealth of nations, including China, and predictions for the future.
"The Wealth of Nations" was the first and still remains the most important book on political economy. And Adam Smith himself is considered the founder of classical political economy; he introduced the term "the invisible hand of the market." Although he did not use the word "capitalism", he is called the father of modern capitalism.
Charles Stearns was an American clergyman and doctor of philosophy.
Rev. Charles Stearns graduated from Harvard College and served the Congregational Church in Lincoln from late 1781 until his death. Several of his sermons were printed in the early 19th century.
In addition, Stearns was principal of the Liberal School, which opened in early 1793, a relatively progressive coeducational institution. While working at the school, Stearns wrote and published a number of works related to education, including Dramatic Dialogues for the Use of Schools (1798), a collection of thirty original plays that were performed by students.
Jonathan Swift was a British-Irish writer, essayist, philosopher, and author of the world-famous satirical novel Gulliver's Travels.
Swift also wrote numerous works, including The Tale of the Barrel (1704), An Argument Against the Abolition of Christianity (1712), and A Modest Proposal (1729). Almost all of Swift's satirical works were published anonymously, giving the author wide latitude in expressing his talent as a satirist.
Swift was a clergyman, made a career in London, became the chief pamphleteer and political writer of the Tories and headed the Tory journal "The Inspector", and then returned to Ireland, where he created his major life's work.
The four-part novel Gulliver's Travels, Jonathan Swift's greatest satire, was first published in 1726 and has since been reprinted hundreds of times in many languages around the world. The author describes in an engaging style the different races and societies that Gulliver encounters on his travels to ridicule the many errors, follies, weaknesses and vices to which people and society at large are subject. The author's boundless imagination, bitter irony, keen intellect and brilliant language give this work a world-class scope.
Voltaire, born François Marie Arouet, was a French philosopher-enlightener of the French Enlightenment, poet and writer, satirist, tragedian, historian and essayist.
Voltaire's long life fell on the last years of classicism and the eve of the revolutionary era, and in this transitional period his works and activities had a significant impact on the direction of European civilization. Through his critical freethinking and wit, Voltaire won the minds of many 18th century European rulers. To this day, he continues to enjoy worldwide fame as a courageous fighter against tyranny, bigotry, and cruelty.
Voltaire was an advocate of freedom of speech, freedom of religion and separation of church and state. He was a versatile and prolific writer in all literary forms, including plays, poems, novels, essays, histories, and scholarly expositions. In total, he wrote more than 20,000 letters and 2,000 books and pamphlets. Voltaire's most famous works are the tragic play Zaire, the historical study The Age of Louis XIV, and the satirical novella Candide.
Johann Wolfgang von Goethe, a German polymath and writer, is celebrated as one of the most influential figures in the German language and Western culture. His vast array of works spans poetry, novels, plays, and scientific writings, reflecting his diverse interests and profound impact on various fields.
Goethe's early life in Frankfurt laid the foundation for his diverse interests. After studying law, he gained fame with "The Sorrows of Young Werther," which led to an invitation to the Weimar court. His contributions there were significant, including roles in the ducal council, mining supervision, and cultural endeavors like theater management and the botanical park's planning.
His literary achievements are vast, with notable works like "Faust" and "Wilhelm Meister's Apprenticeship," which delve into human nature and societal reflections. Goethe's "Sturm und Drang" period was marked by intense emotion and a break from traditional forms, influencing subsequent cultural movements.
Johann Wolfgang von Goethe's interest in science is equally noteworthy. He made contributions to biology, zoology, and color theory, advocating for a holistic view of nature and expressing skepticism toward restrictive scientific methodologies. His works in these areas reflect a deep desire to understand and articulate the natural world's interconnectedness.
For art collectors and experts, Goethe's influence extends beyond his literary and scientific contributions. His role in Weimar Classicism and his artistic endeavors offer rich insights into the period's cultural landscape, providing a multifaceted perspective on his legacy.
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Johann Zahn (German: Johann or Johannes Zahn) was a German scientist and philosopher, optician and astronomer, mathematician and inventor.
Zahn studied mathematics and physics at the University of Würzburg, was professor of mathematics at the University of Würzburg, and served as a canon of the Order of Regular Canon Premonstratensians. His other activities were optics as well as astronomical observations.
In 1686 Johann Zahn invented and designed a portable camera obscura with fixed lenses and an adjustable mirror, which is the prototype of the camera. In his treatise on optics, Oculus Artificialis Teledioptricus (1702), Zahn gives a complete picture of the state of optical science of his time. He begins with basic information about the eye and then moves on to optical instruments. The book is aimed at eighteenth-century microscope and telescope enthusiasts and includes all the necessary details of construction, from lens grinding to drawings.