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Charles Nicolle and the Transmission of Typhus

Charles Nicolle and the Transmission of Typhus

On September 21, 1866, French bacteriologist Charles Juley Henry Nicolle was born. Nicolle was awarded the 1928 Nobel Prize in Medicine for his identification of lice as the transmitter of epidemic typhus. Charles Nicolle was probably inspired to join the field of medicine because his father Eugène Nicolle was a doctor in the French city Rouen. Nicolle attended the Lycée Pierre Corneille in Rouen and earned his M.D. in 1893 from the…
Carl Erich Correns and the Principles of Heredity

Carl Erich Correns and the Principles of Heredity

On September 19, 1864, German botanist and geneticist Carl Erich Correns was born. Correns is notable primarily for his independent discovery of the principles of heredity, and for his rediscovery of Gregor Mendel‘s earlier paper on that subject, which he achieved simultaneously but independently of the botanists Erich Tschermak and Hugo de Vries, and the agronomist William Jasper Spillman. Carl Erich Correns entered the University of Munich in 1885, where…
Duchenne de Boulogne’s Research in Neurology

Duchenne de Boulogne’s Research in Neurology

On September 17, 1806, French neurologist Duchenne de Boulogne was born. Duchenne de Boulogne revived Galvani‘s research and greatly advanced the science of electrophysiology. The era of modern neurology developed from Duchenne‘s understanding of neural pathways and his diagnostic innovations including deep tissue biopsy, nerve conduction tests (NCS), and clinical photography. He was first to describe several nervous and muscular disorders and, in developing medical treatment for them, created electrodiagnosis and…
Jean Sylvain Bailly and the Orbit of Halley’s Comet

Jean Sylvain Bailly and the Orbit of Halley’s Comet

On September 15, 1736, French astronomer, mathematician, freemason, and political leader of the early part of the French Revolution Jean Sylvain Bailly was born. Bailly computed an orbit for Halley’s Comet (1759) and studied the four satellites of Jupiter then known. He was the first Mayor of Paris and presided over the Tennis Court Oath. Jean Sylvain Bailly came from a family of artists. His father was an artist and supervisor…
Sir Andrew Noble and the Science of Ballistics

Sir Andrew Noble and the Science of Ballistics

On September 13, 1831, Scottish physicist Andrew Noble was born. Noble was a gunnery expert, known as a founder of the science of ballistics. He invented the chronoscope, a device for measuring very small time intervals, and used it to measure the velocity of shot in gun barrels. Andrew Noble was commissioned in the Royal Artillery in 1849. He later became secretary of the Royal Artillery Institution. Noble was secretary…
Astronomer James Jeans

Astronomer James Jeans

On September 11, 1877, English physicist, astronomer and mathematician James Hopwood Jeans was born. Jeans was the first to propose that matter is continuously created throughout the universe. He made other innovations in astronomical theory but is perhaps best known as a writer of popular books about astronomy. James Jeans was attended several schools, he joined Merchant Taylors’ School, Northwood, Wilson’s Grammar School, as well as Camberwell and Trinity College, Cambridge.  At…
Augustine Pyramus de Candolle and the Biological Clock

Augustine Pyramus de Candolle and the Biological Clock

On September 9, 1841, Swiss botanist Augustin Pyramus de Candolle passed away. Candolle originated the idea of “Nature’s war”, which influenced Charles Darwin and the principle of natural selection. Furthermore, he recognized that multiple species may develop similar characteristics that did not appear in a common evolutionary ancestor; this was later termed analogy. During his work with plants, de Candolle noticed that plant leaf movements follow a near-24-hour cycle in constant light,…
David Packard and Hewlett-Packard

David Packard and Hewlett-Packard

On September 7, 1912, American electrical engineer and co-founder of Hewlett-Packard, David Packard was born. Packard is noted for many technological innovations and philanthropic endeavors. In 1939, he formed a partnership known as Hewlett-Packard Company with William R. Hewlett, a friend and Stanford classmate. Hewlett-Packard Co. has become a leading manufacturer computers, computer printers, and analytic and measuring equipment. David Packard joined Stanford University where he met his future business partner…
Victor Ambartsumian and Theoretical Astrophysics

Victor Ambartsumian and Theoretical Astrophysics

On September 5, 1908, Soviet astronomer and astrophysicist Viktor Amazaspovich Ambartsumian was born. Ambartsumian is well known as one of the founders of theoretical astrophysics. He worked in the field of physics of stars and nebulae, stellar astronomy, dynamics of stellar systems and cosmogony of stars and galaxies, and contributed to mathematical physics. Victor Ambartsumian was the son of the prominent philologist and writer Hamazasp Asaturovich Ambartsumian, the translator of Homer’s Iliad…
Carl Størmer and the Aurorae

Carl Størmer and the Aurorae

On September 3, 1874, Norwegian mathematician and geophysicist Carl Størmer was born. Carl Størmer is known both for his work in number theory and for studying the movement of charged particles in the magnetosphere and the formation of aurorae. He also contributed both important photographic observations and mathematical data to the understanding of the polar aurora, of stratospheric and mesospheric clouds, and of the structure of the ionosphere. The discovery of…
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