CONT EN TS 
O F 
V O L, LXX. Part II. 
XVII.<TT ~ HEOREMS for computing Logarithms* By 
the Rev. JohnHellins; communicated by the 
Rev. Nevil Mafkelyne, D. D. F. R. S. and AJlronomer 
Royal. page 388 
XVIII. Connoiffdnces effentielles pour juger de quelqueEfpece 
nouvelle de Moulin a Cannes qiion puiffe propofer. Par 
Monfieur Cazaud, Membre de la Societe Roy ale* p. 3 8 8- 
XIX. Account of an OJffication of the Fhoracic Duht. 
By Richard Browne Chefton, Surgeon to the Infirmary 
at Gloucefter; communicated by Mr. Henry Watfon, : 
Surgeon to the Weftminfter Hofpital. p. 323 
XX. An Account of the Fffedt of Electricity in Jhortening 
JVires , By Mr. Edward Nairne, F. R. S* p. 334. 
XXI. Afironamical Obfervations on the periodical Star m 
Collo Ceti. By Mr. William. Herfchel, of Bath;; 
communicated by Dr. Watfon, Jun. of Bath, F. R. S.~ 
P- 336 
XXII. An Account of a new and cheap Method of pre- 
paring Pot-afhj with Obfervations. By Thomas Per- 
eival,. 
