288 JAMES CLEEK MAXWELL. [CHAP. X. 



afford most remarkable and important evidence in favour of 

 the theory of three primary colour -perceptions, a theory 

 which you, and you alone, so far as I know, have established 

 on an exact numerical basis. 



To PROF. J. C. MAXWELL FROM PROF. FARADAY. 



Albemarle Street, 7th November 1857. 



I have just read and thank you heartily for your papers. 

 I intended to send you copies of two of mine. I think I 

 have sent them, but do not find them ticked off. So I now 

 send copies, not because they are assumed as deserving your 

 attention, but as a mark of my respect, and desire to thank 

 you in the best way that I can. 



To PROF. J. C. MAXWELL FROM PROF. TYNDALL. 



Royal Institution, 7th November 1857. 



I am very much obliged to you for your kind thought- 

 fulness in sending me your papers on the Dynamical Top 

 and on the Perception of Colour, as also for your memoir on 

 Lines of Force, received some time ago. I never doubted 

 the possibility of giving Faraday's notions a mathematical 

 form, and you would probably be one of the last to deny the 

 possibility of a totally different imagery by which the 

 phenomena might be represented. 1 



To PROF. MAXWELL FROM PROF. FARADAY. 2 



Albemarle Street, 

 London, 13th November 1857. 



If on a former occasion I seemed to ask you what you 



1 For confirmation of this, see Maxwell's (fragmentary) preface to 

 the smaller treatise on electricity, published posthumously in 1881 ; 

 especially these words : " In the larger treatise I sometimes made use of 

 methods which I do not think the best in themselves, but without 

 which the student cannot follow the investigations of the founders of 

 the Mathematical Theory of Electricity. I have since become aware 

 of the superiority of methods akin to those of Faraday, and have there- 

 fore adopted them from the first." 



2 This letter has already been published in the Life of Faraday. 



