[ 5^4 ] 



\Varfii''s experiments in the d«uble barometer tube, not unlverfally ailmltfed, ibid-. 

 Account of the author's experiments to determine its truth or fallacy, ibid. Tab. IXi 

 fig, I. explained, ibid. Account of various eledrical experiments, p. 274. 276, 

 Mr. Brook's method of making mercurial gages, p. 276, 277. Sec Meteors. 



Variable Star, Obfcrvations on a new one, in a Letter from Edward Pigott, El'q. p. 127. 

 Ufe of verifying (lars fuppofed to be variable, ibid. Variation ot the liar u Antiiioi 

 very fimilar to that of Algol, though not exaiStly the fame in any particular, ibid. 

 Changes undergone by n Antinoi, p. 128. Order ot the liars to which it was com- 

 pared, ibid. Greater difference between the biightnefs of many liars in t.silight and 

 moon-light, or the lealt hazy air, than in a dark and clear fky, ibid. Journal of ob- 

 fervationi of n Antinoi, p. 129. Natural method ot obtaining a point of compa- 

 rifon fur fettling irs penodical changes, p. 131. Com^.utations (the rough length of 

 a fingle period being found;) to obtain greater exaclnels, p. 132. iMethod of deter- 

 mining the time whenn Antinoi was between its lead and greatelt brightnefs, ibid. 

 Obfert'ations on its decreafing brightnefs in 1,783 compared with correfpondino- ones 

 ma«Jc in 17S4, p. 134.. Refults of thofe comparifons, ibid. Account of feveral 

 attempts to determine the relative brightnefs of ftars, p. 135, 136. 



«— — Obfervations oti a new one, byJoh-H Goodricke, Efq. p. 153, The ftar )S Lyras 

 difcovered to be variable, ibid. Eight points of its variation in twelve days and 

 nineteen hours, p. Ijf4, 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. 15^. 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 $ or y Lyrae amongft thofe liars which he fuppofes to have under* 

 gone an alteration, p. 163. 



VincBy Rev, Samuel, M. A. See Summation of hifimte Series^ FriBl0n„ 



t/»/Ww Fi/^, their internal formation, p. 342. ^ 



J^alloty M. See Afironomkal OlftTi'aiiom, 



ITalfhy Mr, Sec Vacuum. 



Watty Mr. See Air and fFater. 



Weighty An Account of fome Experiments on the Lofs of, in Bodies on being melted or 

 heated. By George Fordyce, M. D. p. 361. Several experiments made by the 

 Dodtor, which not being contradiftory, 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. Conjedures of the caufe of the acquifition of 

 weight on water's being converted into ice, p. 363. Method to determine which w 

 true, ibid. Experiment to afcenain whether there is matter abfolutely light, or which 



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