INDEX 



ABD-EL-LETIF, Arabian physi- 

 cian, ii. 21. 



Absolute zero, approach to the, 

 made by liquefying hydrogen, 

 v. 69; probable form of all 

 matter at, v. 70; quest of, v. 

 72. 



Academia Naturae Curiosorum, 

 founded in Germany, ii. 201. 



Accademia del Cimento, ii. 200. 



Adams, John Couch, discoverer 

 of the planet Neptune, iii. 42; 

 discovers an error in Laplace's 

 calculation about the moon, 

 iii. 48. 



Aetius, Byzantine physician, ii. 



3 1 - 



Agassiz, Louis, his idea of the 

 glacial theory, iii. 147; his 

 famous Etudes sur les Glaciers, 

 iii. 154. 



Air, experiments with, iv. 6, 7. 



Air liquefied, v. 45, 46. 



Air-pump invented by Von 

 Guericke, ii. 211. 



Albategnius, astronomer, ii. 15. 



Albucasis, Arabian writer on 

 surgery, ii. 25. 



Alchemy, ii. 124; the four 

 elements, ii. 129; "killing" 

 and "reviving" metals, ii. 

 130; Rosicrucians, ii. 136; 

 Aureacrucians, ii. 136; tricks 

 of alchemists, ii. 138; useful 

 discoveries of alchemists, ii. 

 140. 



Alcmagon, the first Greek anat- 

 omist, i. 171; his explanation 

 of the sense of hearing, i. 172. 



Alemaean, his theories concern- 

 ing the heart and brain, i. 

 126. 



Alexandrian library not burn- 

 ed by Arabs, ii. ii. 



Alexandrian science adds a day 

 to every fourth year, i. 36. 



Alfonso X., Alfonsme tables, ii. 



i?- 



Alhazen, Arabian scientist, ii. 

 18; calculates height of at- 

 mosphere, ii. 19. 



Almagest translated into Arabic, 

 ii. 9. 



Alphabet, the, development of, i. 

 86; introduction of letters, i. 

 87; Egyptian and Assyrian 

 characters, ibid.; first steps 

 in picture-writing, i. 89; 

 Egyptian writing, i. 90; Baby- 

 lonian writing, i. 93; achieve- 

 ment of, i. 98; extension and 

 perfection of, i. 101. 



Alyattus, king of the Lydians, 

 i. 103. 



Amadeo, Avogadro, and law 

 of combinations, iv. 43. 



Amelineau, a student of the 

 phonetic value of Egyptian 

 symbols, i. 28. 



Amici, Giovanni, constructs a 

 reflecting microscope, iv. 112; 

 introduced the improved micro- 

 scope, iv. 113. 



Ampere, Andre Marie, discovered 

 the principles of the science 

 of electro-dynamics, iii. 239; 

 and the law of combinations 

 of volumes, iv. 43; paved the 



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