BIOGRAPHICAL INDEX 



Investigatione Perfectionis," and "Liber Investi- 

 gationis," have appeared in print. 



Gilbert, William, ii, in. Born at Colchester, 

 England, 1540; died Nov. 30, 1603. English 

 physician and natural philosopher. Physician in 

 ordinary to Queen Elizabeth and James I. 

 President of the College of Physicians in 1600. 

 With the doubtful exception of Bacon, Gilbert 

 was the most distinguished man of science dur- 

 ing the reign of Queen Elizabeth. His studies of 

 electricity and magnetism led Priestly to call 

 him "the father of modern electricity." He was 

 the first to discover that the earth is a magnet, 

 and explained the dipping of the needle by the 

 magnetic poles. He also gave the name of 

 "pole" to the extremities of the magnetic nee- 

 dle, and was first to make use of the terms "elec- 

 tric force" and "electric attractions." He was 

 first to distinguish between magnetism and elec- 

 tricity, and made the first electrical instrument 

 ever constructed. He made also the first elec- 

 trical indicating device. The method of magne- 

 tising iron first introduced by him is in common 

 use to-day. 



Gill, Sir David, iii, 67. Born at Aberdeen, 

 Scotland, June 12, 1843. Scottish astronomer 

 and Astronomer Royal at the Cape of Good 

 Hope from 1879. He made five photographs of 

 a comet, and the flecks of starlight on his plates 

 first suggested the possibilities of this method 

 in charting the heavens. His observations of 

 the transit of Venus in 1882 were invaluable in 

 the determination of the distance of the sun 

 from the earth. 



Gladstone, Professor J. H., iv, 68. Born at 



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