88 LETTERS ON SCIENTIFIC SUBJECTS. 



analiticks and geometric from Fermat and Robervall, so that 

 I hope oure age will be famous in that kinde. And so wissh- 

 ing you all happiness I remaine 



Your assured friend to serve you, 



CHARLES CAVENDYSSHE. 



SIR CHARLES CAVENDISH TO JOHN PELL. 



[MS. Birch, Brit. Mus. 4278, fol. 170, Orig.] 



Paris, June 27, olde style, 1645. 



Worthie Sir, I give you manie thankes for your letter of 

 May T 9 ^, which I received not longe since. I writ to you a 

 letter from hence a greate whyle since, in which was one 

 inclosed to Doctor Jungius, and a proposition demonstrated 

 by Mr. Hobbes, all which I hope you have received. I have 

 as you desire procured not onelie the approbation but demon- 

 stration of your fundamentall proposition by Mr. Hobbes his 

 meanes. Fermat is not in this towne, and Mersennus is on 

 his waye hither, so that I knowe not whither to write to him. 

 But I doute not but more handes with demonstrations 

 might be procured if you desire it ; I heare some of them 

 wonder you would not publish a demonstration of it your- 

 self. I tolde Mr. Hobbes I assured myself you coulde 

 demonstrate it, and thought it more obvious than I perceive 

 they thincke it. I am glad you are publishing of Appolonius 

 and Diophantus, though if Goleas meane to publish his 

 Appolonius, I could be content you forbore yours, his being 

 the perfecter copie, and he having bin at some cost about it, 

 though I doute we shall be loosers by it, for I beleeve your 

 notes would abundantlie recompence the defect of your 

 coppie. I have not yet seen Bullialdes Astronomic, but 

 Mr. Hobbes thinckes he hath not much advanced oure knowe- 

 ledge. Mydorgius hath publisshed nothing of late> nor anie 

 of the rest more that I heare of. I hope you proceed with 

 your analytickes, and that er longe you will publish it, for I 

 expect not so mucli from anie man in that kinde as from your- 

 self. I suppose you will one daye advance allso the doctrine 

 of conickes and of other difficulties in geometric. I knowe 

 not when wee remove, nor whither; but when and where- 

 soever I remaine 



Your assured friend to serve you, 



CHARLES CAVENDYSSHE. 



