VI ' ' C O ' N T E N T S. 
XVIIL On the Refolution of attractive Powers . By Edward 
Waring, M. D. F . R. S. and Lucafian Profeffor of Mathe- 
matics at Cambridge. p. 185 
XJX. Experiments on the Congelation of ghiickfher in England. 
By Mr. Richard Walker** in a Fetter to Henry Cavendifh, 
■Efq.F.R.S. ^ p. i 99 
XX. Catalogue of a fecond Thou find of new Nebulre and Clu - 
fers of Stars ; with a few introductory Remarks on the Con - 
jl ruction of the Heavens . * By William Herfchel, LL.D . 
P. R. S. p. 2 1 2 
XXL An Attempt to explain a Difficulty in the Theory of Fifi on , 
depending on the different Refrangibi/ity of Light . By the 
Rev . Nevil Xlalkelyne, D. D. F. R . S. and Afironome'r 
Royal . p. 256 
'XXII. Experiments and Obfervations on Electricity . By Mr. 
William Nicholfon ; communicated by Sir Jofeph Banks* 
Bart . P. R. S. p. 265 
XXIII. Experiments on the Tranfniffion of the V apour of Acids 
through an hot earthen Tube , and further Obfervatio?is relating 
to Thlogifton . By the Rev. Jofeph Prieftley, LL.D. F. R. S. 
p. 289 
XXIV. On the Production of nitrous Acid and nitrous Air. By 
the Rev. If&ac Milner, B. D. F. R* S. and P ref dent of 
Queen’s College, Cambridge. p, j 00 
/ 
PHI* 
