ALL ABOUT TODAY

Kirk Bryan

Born 22 July 1888; died 22 Aug 1950.

American geologist and geomorphologist who pioneered in explaining the forces that molded the present landforms of arid climates. Through his studies inhydrology, Bryan became an authority on the geology of water conservation and dam sites, and on several occasions served as consultant to the Mexican government on the construction of dams and reservoirs for reclamation projects. In 1923-25, Bryan served as geologist on archaeological expeditions in the Chaco Canyon area of New Mexico where he applied geological research as an aid to archaeological and anthropological investigation. His correlations of alluviums, cave deposits bearing artifacts, moraines, and till helped establish the antiquity of man in North America.

Selman Waksman

Born 22 July 1888; died 16 Aug 1973

Selman Abraham Waksman, was a Ukrainian-born (Priluka) American biochemist who was one of the world's foremost authorities on soil microbiology. After the discovery of penicillin, he played a major role in initiating a calculated, systematic search for antibiotics among microbes. In 1939, Dubos, a previous student pointed out a bacteria-killing agent in a soil microorganism. He introduced the term antibiotic, "against life." In 1943, he isolated streptomycin from a mold he had known and studied early in his life. His consequent discovery of this antibiotic streptomycin, the first specific antibiotic effective against tuberculosis, earned him the 1952 Nobel Prize.

Gustav Hertz

Born 22 July 1887; died 30 Oct 1975.

German quantum physicist who, with James Franck, received the Nobel Prize for Physics in 1925 for the Franck-Hertz experiment, which confirmed the quantum theory that energy can be absorbed by an atom only in definite amounts and provided an important confirmation of the Bohr atomic model. He was a nephew of Heinrich Hertz. Although he fought on the German side in World War I, being of Jewish descent, he was forced to resign his professorship (1934) when Hitler took power. From 1945 he worked in the Soviet Union, and then in 1955 was a professor of physics in Leipzig, East Germany.

Gregor Mendel

Born 22 July 1822; died 6 Jan 1884.

Original name (until 1843) Johann Mendel. Austrian pioneer in the study of heredity. He spent his adult life with the Augustinian monastery in Brunn, where as a geneticist, botanist and plant experimenter, he was the first to lay the mathematical foundation of the science of genetics, in what came to be called Mendelism. Over the period 1856-63, Mendel grew and analyzed over 28,000 pea plants. He carefully studied for each their plant height, pod shape, pod color, flower position, seed color, seed shape and flower color. He made two very important generalizations from his pea experiments, known today as the Laws of Heredity. Mendel coined the present day terms in genetics: recessiveness and dominance.

Friedrich Wilhelm Bessel

Born 22 July 1784; died 17 Mar 1846.

German astronomer. In 1809, at the age of 26, Bessel was appointed director of Frederick William III of Prussia's new Königsberg Observatory and professor of astronomy, where he spent the rest of his career. His monumental task was determining the positions and proper motions for about 50,000 stars, which allowed the first accurate determination of interstellar distances. Bessel's work in determining the constants of precession, nutation and aberration won him further honors. Other than the sun, he was the first to measure the distance of a star, by parallax, of 61 Cygni (1838). In mathematical analysis, he is known for his Bessel function.

James Geddes

Born 22 July 1763; died 19 Aug 1838.

Civil engineer, lawyer and politician, born in Pennsylvania but moved to New York state in 1794. The New York State Legislature introduced a bill to fund a feasibility study for a New York State canal, and retained Judge James Geddes (1808) survey routes across the state, east to Lake Erie and Lake Ontario. On 20 Jan 1809, Geddes recommended a Hudson-Erie route to the State legislature. Funding was delayed, but construction on the Erie Canal began on 4 Jul 1817. Taking eight years to complete, it is one of the first great engineering works in North America. Close to 1,000 Erie Canal workers died of malaria in the swamps. Geddes also consulted on canal routes for Ohio.

Pierre Lyonnet

Born 22 July 1708; died 10 Oct 1789

Dutch naturalist and engraver who skillfully dissected insects and made detailed illustrations of their anatomy. He also had a career as an official codebreaker. In 1738 he entered the service of the States General as an administrator of secret expenses and as a code-clerk. In his leisure he turned to natural history. He believed that nature was a cipher that could be interpreted by tracing every detail of its perfect design. He designed a simple microscope which had each lens suspended at the end of a series of ball and socket joints over a small mahogony dissecting table mounted on a post above a wooden base with small drawers containing his instruments. After preparing engravings for several books written by others, he produced his own treatises.« [Other sources list his birth year as 1706 and others as 1707.]