LETTERS ON SCIENTIFIC SUBJECTS. 87 



by his leave I highlie esteem of. I am sorie the peevish Dane 

 Severin diverts you from your better studies, for to my 

 aprehension your refutation is full and plaine, and the pro- 

 position you builde on so obvious, that I thinke I could demon- 

 strate it in ^ of an hour. I have not yet received answeare 

 from Auspurge concerning Reita's glass, but I perceive Mr. 

 Hobbes esteemes neither of his glass nor beleevs his dis- 

 coveries, for he is joined in a greate friendship with Gassendes. 

 I writ to him Gassendes might be deceived as he was about 

 the varieing of the perpendiculars ; he excuses him what he 

 can. Mr. Tassius is sick, but I perceive hee is verie courteous . 

 I have not latelie seen Doctor Jungius, but I have a greate 

 opinion of his abilities. I desire to knowe if all Bonaventura 

 Cavallieros worckes be to be had, as allso Sethus Calvisius 

 worckes of musick, for I sawe heere but some fragments 

 which Mr. Tassius lent me. You will excuse me that I 

 requite not your favoures for the present, as I desire I can 

 onelie yet acknowledge them, but shall heereafter by the 

 grace of God endevoure to requite them to my power. And 

 so wisshing 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. 163, Orig.j 



Hamburg, December ^y> 1644, 



Worthie Sir, I hope you have received my letter which I 

 sent last weeke by my brother's servant. I have little to 

 adde, but this inclosed concerning Reieta's glass. I desire 

 you will be pleased to inquire if he be at Antwerp, and if he 

 be, to inquire of him if one of those glasses maye be had both 

 sooner and at an easier rate. I desire by your next to knowe 

 if Bonaventura Cavelliero and Sethus Calvisius of musick be 

 to be had. I hope you have done with the waiewarde Dane, 

 that you maye returne to Apollonius and Diophantes, but 

 especiallie to your owne analiticall worcke, which I ex- 

 treamelie desire to see. Mr. Hobbes puts me in hope of his 

 philosophic which he writes he is nowe putting in order, but 

 I feare that will take a longe time. I confess I regret much 

 from him and yourself; Mr. Doctor Jungius and Mr.De Cartes 

 I hope hath not yet done. I expect allso some rarities in 



