3^4 Barrow to Mr. Willughby. 



As to the Lines en perje^ having no time to think 

 more, 1 will exfcribe what I writ haftily in a Paper? 

 Book when I read Dctonvilk. 



Mentionem facit Detonvilius de 

 Perils, quas D. Slufius in ordinesdif- 

 pofuit. De illis quid fit nefcio, fed 



tales fuifle conjicio. 



i . Dividatur AB ^qualiter in Z, & 

 habeant fe ordinate ZY ficut AZ x ZB 

 ubiquer ut fi AB==r, &cA7a = a, ia 9 

 3 M i &c. fit ordo 3 0, ra — aa^ zra—^aa^ 



2. Habeant fefe ZY ut AZq * ZB> rraa> — a 3 

 ut fit talis feries < ±raa — Sa 3 



3 ; Series 0, ra 3 —a\ Sra 3 — i d^ 4 5 zjra 3 — 8 1 a^ &c. 



Maxima ordinatarum prout augetur dimcnfionum 

 numerus, eo propius accedit ad B. hinc Per la no- 

 men, ex figurae fimilitudine. Hxc memorise caiusa > 

 qu^e poliantur. 



As for your Statical Quejiion, I remember not to 

 have read concerning it, and Mathematicians gene- 

 rally fuppofe the contrary, or that in all Poltures equal 

 Weights at equal Diftames do equiponderate : The Ef- 

 fe£l perhaps may depend on Caufes bareJy Phyfical. 

 I have no Leifure to write about it now,, yet I will 

 propound one Anfwer, tho' perhaps little fatisfa&ory, 

 (and which indeed does not pleafe my felf.) 



Let 



