BIOGRAPHICAL INDEX 



Born at Mesopotamia cir. 850; died, 929. The 

 greatest of Arabian astronomers, who discov- 

 ered the motion of the sun. Made observations 

 steadily for over 60 years at the Euphrates and 

 at Antioch in Syria. Wrote "The Science of 

 the Stars." Improved Ptolemy's table and came 

 very close to ascertaining the obliquity of the 

 ecliptic. His observations were the foundations 

 of the Alphonsine table of the Moon's motion. 



Albertus Magnus (Albert Count of Bollstadt), 

 ii, 127. Born at Swabia, 1193 or 1205 (accounts 

 vary) ; died at Cologne, 1280. Became Domini- 

 can friar after studying at Padua, and taught in 

 many places. Went to Paris 1230, and devoted 

 himself to spreading the doctrine of Aristotle in 

 spite of the prohibition of the Church. In 1260 

 was made Bishop of Ratisbon. 1262 retired to 

 a convent at Cologne and devoted rest of life 

 to literary pursuits. 



Albucasis (or Albucasim), ii, 25. Born near 

 Cordova, Spain; died, 1106. Famous Arabic 

 physician and author of "Al-Tasrif," a medical 

 encyclopaedia, containing the best treatise on 

 surgery that has come to us from antiquity. 



Alcmaeon, i, 126. Born at Crotona, Italy, sec- 

 ond half of Sixth Century B.C. Greek physician 

 and naturalist. Was the first man to practice 

 dissection, by which he made many valuable 

 discoveries in anatomy. Author of "On Na- 

 ture." 



Alfonso X, ii, 17. Born in 1221 ; died in 1284. 

 King of Leon and Castile. Most learned prince 

 of his time. The chief debt of science to him 

 is the Alfonsine Tables, which he had compiled 

 by fifty of the most celebrated astronomers of 



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