[ 5°4 ] 
Walfh’s expeiifnents in the double barometer tube, not univerfally admitted, ibid. 
Account ot the author’s experiments to determine its truth or fallacy, ibid. Tab. I}£. 
fig. i. explained, ibid. Account of various eleCtrical experiments, p. 274. 276. 
Mr. Brook’s method of making mercurial gages, p.276, 277. See Meteors. 
Variable Star, Obfervations on a new one, in a Letter from Edward Pigott, Efq. p. 127, 
Ufe of verifying liars fuppofed to be variable, ibid. Variation of the liar u Antinoi 
very funilar to that of Algol, though not exaCtly the fame in any particular, ibid. 
Changes undergone by « Antinoi, p. 128. Order of the liars to which it was com- 
pared, ibid. Greater difference between the brightnefs of many liars in twilight and 
moon-light, or the leaf hazy air, than in a dark and clear Iky, ibid. Journal of ob- 
servations of v, Antinoi, p. 129. Natural method of obtaining a point of compa- 
nion for fettling its periodical changes, p. 131. Computations (the rough length of 
a fingle period being founds to obtain greater exaCtnels, p. 132. Method of deter- 
mining the time when v Antinoi was between its leaf and greatefl brightnefs, ibid. 
Obfervations on its decreafing brightnefs in 1783 compared with correfponding ones 
made in 1784, p. 134. Refults of thofe comparifons, ibid. Account of feveral 
attempts to determine the relative brightnefs of liars, p. 133, 136. 
« — - — - Obfervations on a new one, by John Goodricke, Efq. p. 153. The far 0 Lyrte 
difcovered to be variable, ibid. Eight points of its variation in twelve days and 
nineteen hours, p. 134. Its relative brightnefs at its obfcuration in the third and 
feventh points, ibid. p. 161. Magnitudes of the ftars to which it was compared 
during the progrefs of its variation, p. 153. Series of obfervations of its brightnefs 
and magnitude, ibid. Obfervations thereon, p. 161. Calculation of the times of the 
middle of its obfcuration in the third point, p. 162. Remarks thereon, ibid. Mr. 
Herfchel reckons /2 or y Lyrae among!! thofe liars which he fuppofes to have under- 
gone ar. alteration, p. 163. 
Vince , Rev. Samuel, M. A. See Summation of Infinite Series , Fridlion. 
Univalve Fi/b, their internal formation, p. 342. 
w. 
Wallot , M. See Afironomical Obfervations . 
Waljb> Mr. See Vacuum. 
Watty Mr. Stt Air and Water. 
Weighty An Account of fome Experiments on theLofs of,, in Bodies on being melted or 
heated. By George Ford^ce, M. D. p. 361. Several experiments made by the 
DoCtor, which not being contradictory, are not worth laying before the Society, ibid. 
Account of a conclufive one in determining the lofs of weight in ice when thawed, 
and on being heated, ibid. p. 363. Conjectures of the caufe of the acquifition of 
weight on water’s being converted into ice, p.363. Method to determine which is 
$rue, ibid. Experiment to aftertain whether there is matter abfolutely light, or which 
repels 
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