iv CONTENTS, 
XX. Obfervaiions on Mr. Hutchins’s Experiments for determining 
the Degree of Cold at which ^uickflver freezes* By Henry 
Cavendifh, Efq. F. R. S. p. 303 
XXI. Hijlory of the Congelation of uickfilver . By Charles 
Blagden, M. D. F. R. S. Phyfician to the Army* p. 329 
XXII. Experiments relating to Phlogifon , and the feeming Con - 
verfon of Water into Air. By Jofeph Prieftley, LL. D. 
F. R. S . ; communicated by Sir Jofeph Banks, Bart. P. R. S . 
P- 39 8 
XXIII. Defcription of an improved Air-Pump , and the Account 
of jome Experiments made with it. By Mr. Tiberius Cavallo, 
F. R. S. p. 435 
XXIV. Extraft of a Letter from the Rev. James Auguftus 
Hamilton, M. A. to the Rev. Nevil Mafkelyne, D. D. 
F. R. S. giving an Account of his Obfervation of the Fran ft a 
Mercury over the Sun, oj Nov. 12, 1782, objerved at Cook’s-/* 
Town, near Dungannon, in Ireland. p. 453 
XXV. Methodus Inveniendi J treat Curvas ex Proprietatibus Pa- 
ri at ionis Curvatures. Ault ore Nicnlan T .anrWhprk, Mathef. 
Profejf. in Acad. Up fallen f Adjuncts ; communicated by Nevil 
Malkelyne, D. D. F. R . S. and Afronomer Royal. p, 456. 
XXVI. A Series of Obfervaiions on , and a Difcovery of the 
Period of Variation of the Light of the bright Star in the 
Head cy'Medufa, called Algol. In a Letter from John Good- 
ricke, Efq. to the Rev. Anthony Shepherd, D. D. F. R. S. 
Plumian Profejfor of Afronoviy in Cambridge. p. 474 
