LETTERS ON SCIENTIFIC SUBJECTS. 6? 



sent you by this bearer, Mr. Butler, twentie pounds as our 

 acknowledgment of your favoure. And so wishing you all 

 hapiness, I remaine 



Your assured freind, 



CHARLES CAVENDYSSHE. 



SIR CHARLES CAVENDISH TO WALTER 

 WARNER. 



[MS. Birch, Brit. Mus. 4444, fol. 91. Orig.] 



Wellbeck, September 2nd, 1636. 



Worthie Sir, I give you many thankes for the two tracts 

 you sent me, one of the place of the image in concave and 

 convex glasses, and the other of the making of prospective 

 glasses. I will not trouble you with a repetition of some 

 doutes which Mr. Payen and I have of some things in these 

 tracts, but refer you to his letter, for he hath promised me to 

 write to you of them. The greatest doute that I have in your 

 tract of the place of the image is howe the eye can take notice 

 of the lateral I beames which are without the eye, for sight 

 being made, as you write, upon the retiform tunicle, I con- 

 ceive not howe we can take notice of the laterall beams which 

 are refracted before they come thither, or, as I conceive, we 

 take no notice of that refraction. Sir, you see the boldness 

 I take to trouble you, which your former favours have en- 

 couraged me to doe. And so wisshing you all hapiness, I 

 rest, 



Your assured freind, 



CHARLES CAVENDYSSHE. 



ROBERT PAYNE TO WALTER WARNER. 



[MS. Birch, Brit. Mus. 4458, fol. 26. Orig.] 



Welbeck, October 3rd, 1636. 



Good Mr. Warner, Though the plague (thanks be to God) 

 hath not yet come nere us, yett we feele the ill effects of it. 

 One whereof is, the interruption of intercourse of letters fro' 

 us to you, and you to us. 



I had some time since written to you concerning the two 

 tracts you sent last to Sir Charles Cavendysshe, but I was 

 not certaine where you were, or how my letter should come 

 at you. Now having notice of your continuance at Cran- 



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