Numb. 401. 
PHILOSOPHICAL 
TRANSACTIONS 
For the Months of 'January , February , and March, 1728. 
The CONTENTS. 
I. The Anatomy of the Poifonous Apparatus of a 
Rattle-Snake, made by the Direction of Sir Hans 
Sloane, Bart. Praef. Soc. Reg. Sc Coll. Med. 
Together with an Account of the quid Effefis of 
its Poifon 5 by John Ranby, Effo Surgeon to his 
Majejlys Houjhold, and F. 5 ^. S'. 
II. A Letter from the peV. Vr . Samuel Clarke to 
Mr. Benjamin Hoadly, F- % S. occaftond by 
the prefent Contro'VerJy among Mathematicians , 
concerning the Proportion of Velocity and Force 
in Bodies in Motion. 
III. Aftronomical ObferVations made at Vera Cruz, 
by Mr. Jofeph Harris. (fierifed and communica- 
ted by Edm. Halley, LL.D. Aftron. Reg. 
Sc R. S. S. 
b b 
IV. A 
