BIOGRAPHICAL INDEX 



for his invention of the Mercator system of pro- 

 jection of maps. 



Meyer, Lothar, iv, 68. He conceived the so- 

 called "Law of Octaves" afterward fully expli- 

 cated by Mendeleeff (q.v.) under the title of 

 "The Periodic Law." 



Mohl, Hugo von, iv, 125. (See von Mohl.) 



Mohr, Karl Friedrich, iii, 257. Born at Co- 

 blenz, Germany, Nov. 4, 1806; died at Bonn, 

 Sept. 27, 1879. German chemist and physicist. 

 He was first to state the doctrine of the con- 

 servation of energy which he had independently 

 conceived. He did not demonstrate the valid- 

 ity of his conception as clearly as Mayer did 

 five years later, but his conception is apparently 

 the first ever recorded. 



Moissan, Prof. Henri, ix, 328. Born at Paris. 

 Sept. 28, 1852; died Feb. 20, 1907. French chem- 

 ist. Noted for his accomplishments with the 

 electric furnace. In 1892 discovered a method 

 of manufacturing acetylene at a cost that 

 is commercially profitable. In 1893 formed 

 diamonds from iron melted in an electric fur- 

 nace and cooled suddenly. 



Mondino of Bologna, ii, 37. Born in 1276; 

 died in 1326. An Italian physician known as 

 the "restorer of anatomy." He is known to 

 have made careful dissections of the human 

 body, and his writings on anatomy based on his 

 observations were a step in advance over the 

 generally accepted writings of Galen. 



Montgolfier, Joseph Michel, vii, 230. Born at 

 Ardeche, France, 1740; died at Balarnc, France, 

 June 26, 1810. French mechanician and in- 



