KEY AND INDEX 



of ecliptic and came within 23 of being correct. 

 Computed the circumference of the earth to be 

 250,000 stadia. His geography in three books 

 is the first scientific treatise on the subject ever 

 attempted. 



Ericsson, John, vi, 134. Born at Wermland, 

 Sweden; died at New York, March 8, 1889. Fa- 

 mous Swedish-American engineer and inventor. 

 He is best known as the inventor of the caloric 

 engine (1833) and the turreted iron-clad Moni- 

 tor (1862). He applied the screw to steam- 

 ships, invented the torpedo-boat destroyer, and 

 a type of solar engine. 



Erman, Professor Adolf, i, 28. Born at Ber- 

 lin, 1854. German Egyptologist. Educated 

 Berlin and Leipsic. 1885, director of Egyptian 

 Department, Royal Museum, Berlin. 1892, Pro- 

 fessor of Egyptology, University of Berlin. He 

 has put the study of the ancient Egyptian 

 languages upon a scientific basis through a 

 thorough study of its grammar. 



Euclid, i, 193. Lived at Alexandria in Third 

 and Fourth Centuries B.C. Greek geometer, 

 the most famous of antiquity. He worked out a 

 large number of the problems of elementary 

 geometry. 



Euler, Leonhard, iii, 17. Born at Basel, 1707; 

 died at St. Petersburg, 1783. Swiss mathemati- 

 cian. Educated at Basel, receiving master's de- 

 gree at age of sixteen. Studied mathematics, 

 theology, Oriental languages, and medicine. 

 1727, went to St. Petersburg on invitation of 

 Catherine I. Became Professor Higher Mathe- 

 matics, 1733. 1740, called by Frederick the 

 Great to Berlin to take Chair of Mathematics 



