AUTHORITIES AND BOOKS FOR STUDENTS. 



I. GENERAL. 



I HAVE made great use throughout of R. Wolfs Geschichte der 

 Astronomic, and of the six volumes of Delambre's Histoire 

 de V Astronomic (Ancienne, 2 vols. ; du Moyen Age, I vol. ; 

 Moderne, 2 vols. ; du Dixhuitieme Siecle, I vol.). I shall subse- 

 quently refer to these books simply as Wolf and Delambre 

 respectively. I have used less often the astronomical sections 

 of Whewell's History of the Inductive Sciences (referred to as 

 Whewell), and I am indebted chiefly for dates and references 

 to the histories of mathematics written respectively by Marie, 

 W. W. R. Ball, and Cajori, to Poggendorffs Handworterbuch 

 der Exacten Wissenschaften, and to articles in various bio- 

 graphical dictionaries, encyclopaedias, and scientific journals. 

 Of general treatises on astronomy Newcomb's Popular Astro- 

 nomy, Young's General Astronomy, and Proctor's Old and New 

 Astronomy have been the most useful for my purposes. 



It is difficult to make a selection among the very large number 

 of books on astronomy which are adapted to the general reader. 

 For students who wish for an introductory account of astronomy 

 the Astronomer Royal's Primer of Astronomy may be recom- 

 mended ; Young's Elements of Astronomyis a little more advanced, 

 and Sir R. S. Ball's Story of the Heavens, Newcomb's Popular 

 Astronomy, and Proctor's Old and New Astronomy enter into 

 the subject in much greater detail. Young's General Astronomy 

 may also be recommended to those who are not afraid of a 

 little mathematics. There are also three modern English books 

 dealing generally with the history of astronomy, in all of which 

 the biographical element is much more prominent than in this 

 book : viz. Sir R. S. Ball's Great Astronomers, Lodge's Pioneers 

 of Science, and Morton's Heroes of Science : Astronomers. 



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