84 LETTERS ON SCIENTIFIC SUBJECTS. 



SIR CHARLES CAVENDISH TO JOHN PELL. 



[MS. Birch, Brit. Mus. 4278, fol. 155, Orig.] 



Worthie Sir, Manie thankes for yours of the T 7 7 of Sep- 

 tember. I am sorie for Beaugrand and Herrisons deathes, 

 but I hope it will make you nowe seriouslie thinke of pol- 

 lishing and publishing your former thoughts of analiticks. I 

 never sawe Harrison's 6th tome, nor I thinke his 5th, yet 

 somewhat of algebra in those tomes I have, but nothing newe 

 as I remember, or verie little. From Robervall and Fermat 

 I expect much. Nicerons perspective I thinke I have at Lon- 

 don, and as I remember one hath manifestlie convinced his 

 booke of error ; but if I mistake, and that you aprove of Ni- 

 cerons perspective, I desire you will send it me. If there be 

 anie more than is in that little booke allreadie extant, con- 

 cerning the newe jomales, you shall doe me a favoure to send 

 it me. I am extreamelie taken with Des Cartes his newe 

 booke, yet I thinke Kercher the Jesuit of the loaldestone 

 hath prevented Des Cartes, for they differ little as I remem- 

 ber ; I confess I conceive not howe the particulse striatae by 

 theyr motion can reduce a loadestone, or touched needle (for- 

 merly moved from theire meridian), to their meridian againe ; 

 or if they doe, the situation of the poles would be contrarie to 

 Des Cartes his description. I beleeve Mr. Hobbes will not 

 like so much of Des Cartes newe booke as is the same with 

 his metaphisickes, but most of the rest I thinke he will. 

 Doctor Jungius hath bin once with me, I like him extreamelie 

 well, but I cannot speake Latin well nor readilie, which hin- 

 dered me of divers quaeres, and besides I would not trouble 

 him too much at the first visit. I finde him verie free, and 

 intend, God willing, to be better acquainted with him. He 

 approves of your confutation of Longomontanus, though he 

 seemed to thinke Long, would take exceptions that you use 

 tangents, which he refuses to be tried by. If Gassendes Phi- 

 losophic be extant I praye you send it me. I have not yet 

 seen Mr. Tassius, but he sends me word he will come to me. 

 They are commonlie full of business or els I would often visit 

 them. I mervaile you have not received 5, which I paied 

 to Mr. John D'Orvill longe since, who promised to doe it 

 with all convenient expedition ; but I hope you have received 

 it before nowe. I have troubled you enough for once. 

 I remaine your assured friend to serve you, 



CHARLES CAVENDYSSHE. 



Doctor Jungius preferrs the analiticks of the ancients be- 



