to Sir Hans Sloane, (Bar*- Tree/. Coll. Med. tr 
% S. concerning the Froft in January, 1 7 3 f. 
V. A Letter to Cromwell Mortimer, M. D. 
Seer. Of S. containing federal Experiments con - 
cerning Electricity 5 by Mr. Stephen Gray. 
VI. CurVarum Elyperbolicarum, dquationibus trium 
nominum utcunque definitarum , Quadratures gene- 
ralis duplici Theoremate exhibita a D°. Samueie 
Klingenftierna, Drofeff. Digniff. Math, in Acad. 
Upfal, isr LQS.S. Conmunicante D 0 . Jacoho 
Stirling , ejufdem etiam Soc. DoEliJJ. S. 
VII. Ca/us rarijfimus Plica Polonicte enormis d D. 
Abrahamo Vatero, M.T>. <Prof. Anatom. Wit- 
tem.be.rg, & % S. S. per D. Conradum Spren- 
gell, Equitem y M. D. LQ S. S. Cf Coll. Med. 
Lond. Licent. communicatus. 
VIII. An Extract of a Letter from Sir Conrad 
Sprengell, M. D. (^. 5 . S. & Coll. Med. Lond. 
Licen. to Dr. Mortimer 5 wherein he inclofed the 
foregoing Account of the Plica Polonica $ toge- 
ther with an Article from the 'BteflatD ©flltl Killing 
fcon Ji5atut- unti ^eOlcht, &c. ©efcljtcljtett, upon the 
fame Subject , tranflated from the High-Dutch 
by Dr. Mortimer, 2 ^. 5 . Seer. 
IX. An Account of an unufual Agitation in the Mag- 
netical Needle, obferved to la ft for fome Time , 
in a Voyage from Maryland, by Capt. Walter 
Hoxton ; communicated in a Letter to David 
Papillon, Efq-y F. % $. 
