LBTTBBI OW SCIENTIFIC II B 



SIR CHARLES CAVENDISH TO JOHN PELL. 



[MS. Bird., Mrit. Mus. 4278, f.,1. 184, 



Wi-llini,'iir. .him- 'Jti, lf,H. 



Sir, I perceive oure business of making the per>p-, 

 glass proceeds not, and I knowe not \\ell hm\r to help it, 

 unless there be some as good matter to make glass in some 

 other place to be bought, for it seemes that at Rroadstm-t 

 will not be had; I am not willing to trouble Sir Robert 

 Mansteild about it, though I thinke he \\onld not denie me. 

 Therefore, if you or Mr. Reaves can finde fitting matter for 

 us somewhere els, ye should doe me a greate favoure ; Broad- 

 street I suppose will be the best place to make the glass, when 

 ye have bought the stuff to make it of. I shall write to Mr. 

 Reaves to give us his help herein. I must againe thanke you 

 for your waie of ordering ^equations, and doe desire that you 

 will proceed in your intended analyticall worcke, as your oc- 

 casions will give you leave. I desire to knowe if Mr. War- 

 ners analogicall worck goe on or not. And so wisshing you 

 all hapiness I remaine 



Your assured freind to serve you, 



CHARLES CAVENDYSSHE. 



If you knowe an easie and readie waie to measure the re- 

 fraction in water, you should doe me a favoure to let me knowe 

 it; for I confess I knowe none. 



SIR CHARLES CAVENDISH TO JOHN PELL. 



[MS. Birch, Brit. Mus. 4278, fol. 136. Orig.] 



Wellingor, Julie 24, 1641. 



Worthie Sir, I am glad to heare you have got some glass ; 

 I hope it is good and fit for oure purpose, for I should be 

 unwilling that you and Mr. Reaves should bestowe your 

 paines upon course glass. When you have tried what the 

 refraction is in that glass I desire to knowe it, and allso howe 

 you like the glass. I have latelie received some propositions 

 out of France, some demonstrated and some not, but I will 

 not divert you from the business you have in hand. I am 

 glad you have begun the analogiques, and hope allso that you 

 proceed in your owne analiticall worcke. And so wisshing 

 you all hapiness, I remaine 



Your assured freind to serve \<>u. 



CHARLKS CAVENPYSSM i.. 



