Authorities and Books for Students 413 



Tychonis Brake. The portrait is a reproduction of a picture in 

 tne possession of Dr. Crompton of Manchester, described by him 

 in the Memoirs of the Manchester Literary and Philosophical 

 Society, Vol. VI., Ser. III. For minor Continental writers I have 

 t sed chiefly Wolf and Delambre, and for English writers, 

 Whewell, various articles by De Morgan quoted by him, and 

 articles in the Dictionary of National Biography. 



Students will find in Dreyer's book all that they are likely to 

 want to know about Tycho. 



Chapter VI. For Galilei's life I have used chiefly Karl von 

 Gebler's Galilei und die Romische Curie, partly in the original 

 German form and partly in the later English edition (translated 

 by Mrs. Sturge). For the disputed questions connected with the 

 trial I have relied as far as possible on the original documents 

 j) reserved in the Vatican, which have been published by von 

 Gebler and independently by L'pinois in Les Pieces du Proces 

 de Galilee : in the latter book some of the most important docu- 

 ments are reproduced in facsimile. For personal characteristics 

 I have used the charming Private Life of Galileo, compiled 

 chiefly from his correspondence and that of his daughter* Marie 

 Celeste. I have also read with great interest the estimate of 

 Galilei's work contained in H. Martin's Galilee, and have probably 

 borrowed from it to some extent. What I have said about 

 Galilei's scientific work has been based almost entirely on study 

 of his own books, either in the original or in translation : I have 

 u-ed freely the translations of the Dialogue on the Two Chief 

 Systems of the World and of the Letter to the Grand Duchess 

 Christine by Salusbury, that of the Two New Sciences by 

 Weston (as well as that by Salusbury), and that of the Sidereal 

 Messenger by Carlos. I have also made some use of various 

 c ontroversial tracts written by enemies of Galilei, which are to be 

 found (together with his comments on them) in the magnificent 

 national edition of his works now in course of publication ; and 

 of the critical account of Galilei's contributions to dynamics 

 contained in Mach's Geschichte der Mechanik. 



Wolf and Delambre have only been used to a very small 

 extent in this chapter, chiefly for the minor writers who are 

 referred to. 



The portrait is a reproduction of one by Sustermans in the 

 Uffizi Gallery. 



There is an excellent popular account of Galilei's life and 

 work in the Lives of Eminent Persons published by the Society 

 f >r the Diffusion of Useful Knowledge ; students who want 

 fuller accounts of Galilei's life should read Gebler's book and 

 the Private Life, which have been already quoted, and are 

 strongly recommended to read at any rate parts of the Dialogue 



