LETTERS ON SCIENTIFIC SUBJECTS. 83 



SIR CHARLES CAVENDISH TO JOHN PELL. 



[MS. Birch, Brit. Mus. 4278, fol. 153, Orig.] 



Hamburg, Aug. f , 1644. 



Worthie Sir, Yesterday e I received yours of the |- of 

 August, for the which I give you manie thankes. I heare 

 nothing yet of our removing from hence, if we should remove 

 into Hollande I should be in hope to see you, and intended 

 to see De Cartes, but you write he is gone to Paris. I desire 

 your judgment of De Cartes his new booke. Doutelesse he 

 is an excellent man. I hope Mr. Hobbes and he will be ac- 

 quainted, and by that meanes highlie esteeme one of another. 

 I am sorie Mr. Warner's analogicks are not printed, but I yet 

 hope they maye, as also other worckes of that excellent olde 

 man. I am glad you intend to secure your thoughts by pub- 

 lishing them, and that you are printing Diophantus with 

 newe illustrations after your manner, which I am exceeding 

 greedie to see, but I doute you will not in this worcke teache 

 us the whole science of analiticks with all that pertaines to 

 it, which if you doe not nowe, I beseech you doe heereafter, 

 for I suppose you intended such a woorck, and if you finish 

 it not, I doute wee shall have no better analiticks than wee 

 have. I have not yet received your refutation of C. S. Longo- 

 montanus his quadrature of a circle, but I shall inquire dilli- 

 gentlie for it, for I longe to see where he goes out of the waye. 

 I am well acquainted with Mr. Gascoine, whoe was providore 

 to oure armie : he is an ingenious man and hath shewed me 

 howe perspectives maye be much improved; I onelie mislike 

 his glass next the eye which he makes convex on both sides ; 

 I tolde him it woulde make confused sight, if De Cartes his 

 doctrine be true, but upon triall it proved more distinct than 

 I expected, yet I thinke a concave on that side next the eye 

 would doe better ; his perspective did not multiplie more than 

 myne as I thinke, but his speculation is most true, and this 

 was one of his first trialls and not made to the manner of his 

 best inventions. Wee lodge neere St. John's Church. And 

 so wisshing you all happiness, I remaine 



Your assured freind to serve you, 



CHARLES CAVENDYSSHE. 



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