y* A Letter to ©rjurin. Coll Med. Lond. Soc. 
^ Seer. S. concerning the abovementioned Jp^ 
pearance in the (^inboWy with fome other (Lefle^ 
Ctions on^the fame SubjeB. !By Henry Pem- 
berton, M.D. ^S.S* 
yi. ^art of two Letters concerning a Method of 
' procuring the Small <Pox, ufed in South Wales. 
From Perrot Williams, M. D. Thyjlcian at 
Haverford Weft, to Dr. Samuel Brady, 
fician to the Garrifon at Portfmouth. 
VII. ^art of a Letter from the fame Learned and 
Ingenious Gentlemany upon the fame Subjeliy to 
£)r. Jurin, ^S. Secret. Q:> 
/ o 
VIII. A Letter on the fame f^n Mr. Ri- 
chard Wright, Surgeon at Haverford Weft, to 
Mr. Sylvanus Bevan, Apothecary in London. 
IX. An Account of fome Experiments* made to pro^Cy 
that the Force of Moving Dodies is proportionable 
to their Velocities: {or rather that the Momen- 
tum of Moving Dodies is to he found by muU 
tiplying the Maffes into the Velocities) In Anfwer 
to fuch who have fometime ago affirrndy that that 
Force is proportionable to the Square of the Velo» 
cityy and to thofe who flUl defend the fame Opinion. 
Dy the (Kmrew^/John Theophilus Defaguliers, 
LL.D.F.%S. 
I. Obfervations 
