KEY AND INDEX 



Born at Sangerville, Me., Feb. 1840. American- 

 English inventor. He is noted for his inven- 

 tion of automatic firearms, and for his studies 

 of aerial navigation. In 1894 he demonstrated 

 that a heavy machine properly equipped with 

 plane-surface could be made to rise from the 

 ground and be sustained by the air. 



Maxwell, James Clerk, iii, 44. Born at Edin- 

 burgh, Nov. 13, 1831 ; died Nov. 5, 1879. Scotch 

 physicist. Especially remembered for his studies 

 of the motion of Saturn's rings, and his investi- 

 gation's as to the nature of electricity and mag- 

 netism. In 1871 he published his "Theory of 

 Heat," and in 1876, "Matter and Motion." 



Mayer, Dr. Julius Robert von, iii, 258. Born 

 at Heilbronn, Wurtemberg, Nov. 25, 1814; died 

 at Heilbronn, March 20, 1878. German physi- 

 cian and physicist. In 1842 he originated the 

 mechanical theory of heat, and propounded the 

 entire doctrine of the conservation of energy. 

 He was led to his conclusions by the observa- 

 tions made on patients while acting as surgeon 

 on a Dutch India vessel cruising in the tropics. 



Mendeleeff, Dmitri Ivanovitch, iv, 68. Born 

 at Tobolsk, Siberia, Feb. vii, 1834. Celebrated 

 Russian chemist. He was the discoverer of the 

 periodic system of the chemical elements. This 

 discovery had enabled Mendeleeff to predicate 

 the existence of new elements years before they 

 were discovered. 



Mercator (right name Gerhard Kremer), vii, 

 30. Born at Rupelmondo, Belgium, March 5, 

 1512; died at Dinsburg, Prussia, Dec. 2, 1594. 

 Flemish geographer. Remembered particularly 



