LBTTBRI <>\ sci |.-\ i | , ,, 



mean time, our mathemat icall mechanician- due not \\;u, 

 rrptions against the e\t raonlinarincs ol'thc contn\.i 

 ******** 

 Your Lordship's very humble and faithful sen ant, 



II. O. 



For the Right Honourable the Lord Br ere ton 

 at Brereton in Cheshire. Stonebagg. 



P.S. Mr. Hook presents his humble service to your Lord- 

 ship, and begs the favor to send him some account of the 

 causeway found so deep under ground, and of what shels are 

 found in stones, or ligna fossilia &c. Whereby you will 

 much oblige him. 



MICHAEL DARY TO JOHN COLLINS. 



[MS. Birch, 4425, fol. 54, r. Orig.] 

 The equation is this : 



+ V 4 + 8 y 3 - 24 y* + 104 y 676 = 



Mr. Collins, I have beene lately trying to break biqua- 

 dratique equations into two quadratique ones, and I have 

 effected my purpose in a great many, some by the aliquote 

 parts, and some by the cubicall mant, but this soure crabb I 

 cannot deale with by no method, &c. 



Your servant, 

 MICH : DARY. 



Tower, the 8th Febr: 1674-5. 



NOTE ON THE SOLVING EQUATIONS, BY JOHN 



PELL. 



[MS. Birch, Brit. Mus. 4432, fol. 26, Orig.] 



May -JO. LI 



Mr. Dary only solved cubick equations by ayd of a qua- 

 dratick equation in a particular case, not knowing the use of 

 both the rootes of his qimdratick equation; but Collins 

 knowing how to take away two teanno in any equation 

 hath a different gencrall method of bohinir these anil higher 



