74 PHILOSOPHICAL TRANSACTIONS. [aNNO 1673. 



the blood of it was stopped with nothing else but a lint dipped in this liquor; 

 left fastened on to the artery till next morning. He adds, that from Maestricht 

 also he is informed, that with the same liquor the blood of a leg had been stop- 

 ped, the half of which had been carried away by a cannon-ball. 



M. Slusius^s Demonstration of his Method* of Drawing Tangents to all Curves, 



N° 95, p. 6059. 



My method is the same as I have used for many years, and by help of which 

 I have shown how to determine the contrary flexure of curves, and the limits of 

 problems in my Miscellanies, and also, if I remember right, formerly in my 

 letters to you. How I discovered it, and in what way it is demonstrated, you 

 will easily understand. Indeed I have announced to a few others, like as I did 

 formerly to you, and in the common characters, that I perform it by certain 

 lemmas ; which are as follow : 



1. The difference of two powers of the same degree, divided by the difference 

 of their roots, gives the several members of the next inferior power of their 



binomial; as ^ — = yy -\- yoc + xx. This instance is chosen among many 



others, as is easily shown. — 2. There are as many terms in any power of a bino- 

 mial, as there are units in the exponent of the next higher power ; viz. three in 

 the square, four in the cube, &c. As is commonly known. — 3. If the same 

 quantity be divided by two others, of a given ratio, the quotients will be reci- 

 procally in the same given ratio — which is evident. 



By these lemmas my method is demonstrated ; which you will soon accom- 

 plish, as I have disposed them in such order as leads one, as it were by the hand, 

 to the demonstration. 



On the Veins in Plants. By Dr. Wallis. N° 95, p. 6060. 



As to the veins of plants, which Mr. Lister observes (N° 90) are not ramified, 

 but rather bundles of them divaricated ; in this they resemble the nerves, which 

 (as Dr. Willis de Cerebro observes) go together in that which seems the 

 common trunk, like a bunch of threads, which afterward separate and are vari- 

 ously divaricated ; and these nerves, being cut, shrink up, as the veins of plants, 

 as much or more than the veins or arteries of animals. 



Dr. Wallis observes also, that there are two sorts of nerves ; one arising 

 from the Cerebrum, subservient to voluntary motions, and of which we are 

 conscious or take notice, and which properly belong to the functions of the 



* Given in No. 90. p. 38. 



