[ 446 ] 
of electricity by friction, which is dependent upon tfie propofition, viz, that bodies 
are always in fome degree electrified; and alfo upon the principle or the capacity of 
bodies for holding eleftric fluid being increafed by the proximity of other bodies in 
certain circumilances, p. zi. Defcripticn of a new electrical inflrument, p. 25^. 
Description of an inflrument which produces the two ilates of electricity without friction 
or communication with the earth, p. 403. 
Experiment, proving that the nerves are not employed in the motions excited by flimuli, 
p. 27. Frigorific experiments on the mechanical expanfion of air, explaining the 
caufe of the great degree of cold on the Summits of high mountains, the fudden con- 
denfation of aerial vapour, and of the perpetual mutability of a’mofpheric heat, p, 43. 
Experiments on local heat, p. 103. Experiments relating to the variation of local 
heat in the earth itfelf, p. no. On the Barbary, p. 158. Experiments on the cool- 
ing of Water below its freezing points, p. 125. Experiment on very hard puinp- 
water, which generally congealed one or two degrees fooner than unboiled dillilled 
water, when placed in a frigorific mixture, p. 127. Various experiments on the 
cooling of water, p. 129, 130. Experiments and obfervations relating to the prin- 
ciple of acidity, the compolition of water, and phlogifton, p. 147. Additional ex- 
periments on the fame, p.313. Experiment on th t Ruta cbalepenjis, p. i6z. Expe- 
riments on fpirit of nitre, p. 167. Experiments on fpirit of vitriol, p. 16S. 
Experiments on a new eleCtrical inflrument, p. 238, 239. Experiment on the con- 
verfion of a mixture of dephlogifticated and phlogiflicated airs into nitrous acid, by 
theele&ric fpark, p. 261. Experiments on the effect of various f'ubflances in lowering 
the point of congelation in water, p. 277. Experiment, proving that nitrous air 
contains water, and that this water can contribute to the formation of fixed air, p. 
318. Experiments on liquor produced by burning, in a clofe copper veflel, inflam- 
mable air, got from Iron by means of the fleam of water, and dephlogifticated air, 
expelled by heat only, from Minium, p. 320. Experiments on liquor produced by 
burning, in the fame manner, inflammable air, obtained from Iron by ineans of the 
fleam of water, and dephlogifticated air, expelled by heat only, from Manganefe, 
ibid. Experiments on thefe liquids, made from Minium and Manganefe, united, p, 
321. Experiments on liquor, produced by burning inflammable air, obtained as 
before, and dephlogifticated air from Mercurius precipit. ruber, in a clofe tinned iron 
veflel, ibid. Experiments on the formation of volatile alkali, and on the affinities of 
the phlogiflicated and light inflammable airs, p. 379. Experiments on the production 
©f artificial cold, p. 395. 
F. 
Fig, Indian, CaCtus Tuna, a kind of, p. 161. 
Fluid, ele&ric, on the hypothefis of a Angle, it is laid, that every fubflance in nature, 
when 
