[/ii] Num. If 7, 
PHILOSOPHICAL 
TRANSACTIONS. 
March 20. i68|. 
I 
The CONTENTS. 
Of the nature of Earth-quakes. More particularly of the 
Origin of the matter of them^ from the Pyrites alone. 
2. Concerning the spontaneous firing of theVyni^s» 3 Con- 
cerning Thunder ^/^^Lightning, proceedingfrom the Py- 
rytes, all by Martin Lyfter M. 2). of the Univerlity 
of Oxen, and Fellow of the Royal Society. 4. Re- 
lation of the ejfeB of a Thunder-Glap on the compafs 
of a Ship on the Coafi of New-England. 5- A Letter 
of Sir K.S. concerning the j^rw^r Relation. 6 An ab' 
JiraB of a Treatife of the Calculus Humanus in an- 
frver to fever al Queries pr opofed by the 'Right Worjhipful 
sir John Hoskins Knight \ By the Learned and Inge'- 
niousYxtA. Slare Med. Dr. and Fellow of the Koy^l So- 
ciety. 7 ^Poftfcript to the Publiftier , containing a 
Jbort account of two tLum^Ln Cixlculi of an unufual form 
arid bignefs^ from the famslB- S. M.D. 8 An account of 
a Polypus found in the heart of a perfon vhat died Epi- 
leptical, at Oxon. by W. G. M. B. fellow of Wad- 
ham CoIIedge and of the Royal Society. An account 
of aBoo\,vi'^. T/?^ Geometrical Key, or the Geometry 
©/^//Equations Linear, Quadratick, Cubick and 
Biquadratick, by a Circle and one only Farabole-^ by 
Mr. T H O; B A K E R; ReBor ^^Bifliop Nympton in 
Devonjhire. 
L Three 
