Co Ook Be 
“XXIL On the Period of the Changes of -Light in the Star. 
Algol. In a Letter from John Goodricke, E/g. to the Rev. 
Anthony Shepherd, D. D. F. R. S. Profeffar of Aftronomy 
aé Cambridge. p. 287 
XXIII. Experiments and Daeeoate on the Terra Ponderola, 
&c. By William Withering, M. D.; communicated 4 
Richard Kirwan, E/g. FAR. S. ) Pp: 293 
XXIV. Odjfervations du Paffage de Mercure fur fe Difque du 
Soleil le 12 Novembre, 1782, faites a l’ Obfervatoire Royal de 
Paris, avec des réflexions fur un effet qui fe fait fentir dans ces 
mémes Obfervations femblable & celut dune Réfraction dans 
l’ Atmofphere de Mercure. Par Johann Wilhelm Wallot, 
Membre de I’ Académie Electorale de Sciences et Belles Lettres 
de Manheim, Gc. Communicated by Joleph Planta, E/g. 
Sec. R. S. Pp» 312 
XXV. Thoughts on the confiituent Parts of Water and of De- 
phlogificated Air; with an Account of fome Experiments on 
that Subject. In a Letter from Mr. James Watt, Engineer, 
to Mr. De Luc, F. R. S. Pp. 329 
XXVI. Sequel to the Thoughts on the confiituent Parts of Water 
and Dephlogifticated Air. In a fubfequent Letter from Mr. 
James Watt, Engineer, to Mr. De Luc, FL. RS.  p. 354 
XXVII. An Attempt to compare and connect the Thermometer for 
ftrong Fire, defcribed in Vol. LXXII. of the Philofophical 
Tranfactions, with the common Mercurial Ones. By Mr. Jofiah 
Wedgwood, F. R. S. Potter to Her Majefty. p- 358 
XXVUI. On the Summation of Series, whofe general Term is a@ 
determinate Funélion of z the Diftance from the firfi Term of — 
the Series. By Edward Waring, M. D. Lucafian Profeffor 
of the Mathematics at Cambridge, and Fellow of the Societies 
of London azd Bononia. p- 385 
XXIX, 
