MAGNUS HEINRICH GUSTAV: (1802-1870) German Scientist. The ''Magnus effect'' is named after him. A very good A.L.S., `G.Magnus´, four pages, 8vo, Berlin, 23rd February 1846, in German. Magnus thanks his correspondent for the work ''Studies on Hygrometry'' sent to him, and states in part `I would like to get for the University collection one Conservative Hygrometer.. Knowing that you were working on the steam elasticity at high temperatures and all incidents going within the steam engines theory… ¨, further saying `..if I was not working on the gas absorption in liquid and solid corps, which my respiration works were taking me to..´ further on referring to Gay Lussac stating `I do hope that Palouze did forward to you one of my respiration treaties copy. My desire would be to see him accepted in the records of Chemistry and Physics. Since Mr. Gay Lussac attacked me in such an unfair way..´ A lengthy scientific explanation about his works and results obtained comparing the air and gas different dilatation coefficients. A letter of good association and scientific content. G to VG £600-900 Joseph Gay-Lussac (1778-1850) French Chemist and Physicist. Known for his la720ws related to gases, and for the degrees Gay-Lussac used to measure alcoholic beverages.