KEY AND INDEX 



ory, which with Arago's assistance he afterward 

 proved. Made investigations in polarized light, 

 and applied improved and scientific methods to 

 the making of lighthouse lenses. 



Fulton, Robert, vii, 70; vii, 98. Born at Little 

 Britain, Pa., 1765; died at New York, Feb. 24, 

 1815. American inventor, whose invention of 

 the steamer "Clermont" opened the era of steam 

 navigation. He began life as a portrait- and 

 landscape-painter, but soon abandoned art to de- 

 vote his time to engineering. While residing in 

 France in the closing years of the Eighteenth 

 Century, he invented torpedo boats and subma- 

 rine boats. There, also, he built a steamboat 

 which made a successful trip on the Seine in 

 1803. 



Galen (Claudius Galenus), i, 272. Born in 

 Pergamum, 130; died in Sicily, 201. Greek phys- 

 ician. Studied in Pergamum, Smyrna, Corinth 

 and Alexandria. Went to Rome, where he at- 

 tended the Emperor. Wrote many treatises on 

 all branches of medicine, of which those on anat- 

 omy and physiology are most valuable. He 

 bases his practice on two principles: First, that 

 disease must be overcome by something contrary 

 to disease itself. Second, that nature is preserved 

 by that which has relation to nature. 



Galilei, Galileo, ii, 76. Born at Pisa, Feb. 14, 

 1564; died at Arcetri, Jan. 8, 1642. Famous Ital- 

 ian physicist and astronomer. Discovered the 

 ischronism of the pendulum in 1583, and the 

 hydrostatic balance in 1586. Constructed a ther- 

 mometer in 1597. Professor of mathematics at 

 Padua 5> 1592 to 1610. While at Padua he made 

 many inventions, the most important being the 



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