BIOGRAPHICAL INDEX 



dualistic theory was further developed by Plato 

 and Aristotle. He was banished from Athens 

 for the impiety of his explanation of natural 

 phenomena. He may have been guilty of disre- 

 spect for the gods, but he came very near to 

 being right in his explanation of the causes of 

 the rainbow, the Moon's light, the winds, and 

 the origin of sound. He died a wanderer in 

 exile. 



Anaximander, i, 109. Born at Miletus, 610 

 B.C.; died in 546 B.C. Successor of Thales as 

 head of the Ionian School; was a great mathe- 

 matician and astronomer, as well as philosopher. 

 Taught the obliquity of the ecliptic, and intro- 

 duced the sun-dial into Greece. It is believed 

 that he invented geographical maps. Conceived 

 the universe as a series of concentric cylinders. 

 As a philosopher he believed the phenomenal 

 world to proceed from some indefinite or inde- 

 terminate principle, similar, perhaps, to the 

 chaos of other philosophers. There was no such 

 thing as creation out of nothing, but the atoms 

 of primary matter change their relative posi- 

 tions through some innate power and become 

 the contents of the phenomenal world. 



Anaximenes, i, 109. Born at Miletus, flour- 

 ished Sixth Century, B.C. He taught that air 

 was the primary form of matter, and that all 

 things were formed from it by compression. 



Arago, Dominique Francois, iii, 67. Born at 

 Estagel, France, 1786; died at Paris, 1853. 

 French physicist and astronomer. Became pro- 

 fessor of analytical geometry and geodesy at the 

 ficole Polytechnique, Paris, but afterward de- 

 voted more attention to astronomy, electricity, 



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