INDEX. 507 
Heat. Of boiling fluids, variable, p. 220. Heat, and 
elafticity, their connection, p. 267. 
Heat, a caufe of partial condenfation, p. 285. Solution 
of the paradox, p. 286. 
Henley, Mr. his electrical experiments on the means of 
fecuring buildings againft the flroke of lightning, 
p. 133. Account of forne new electrical experiments, 
p. 389. _ 
High fituations, their healthinefs demonflrated by tables 
of mortality for a diftridt in Switzerland, p. 97. 
Hindojlan, account of the fon or fun-plant of that coun- 
try, p. 99. The method of manufadbring paper there, 
p. 160. 
Holland, Mr. Samuel, his account of forne eclipfes of 
Jupiter’s fatellites, obfervedin North America, p. 176. 
His obfervations at Kittery Point and Portfmouth, 
p. 182. 
Horf.ey, the Rev. Dr. his comparifon of M. de Luc’s rules 
for the meafurement of heights by the barometer with 
theory, &c. p. 214. 
Houfe-martin, or martlet, account of, p. 196. Manner 
of building their nefls, and treatment of their young, 
p. 197, 198. How ditlinguifhed from their congeners, 
p. 201. Their feafon of congregating, p. 1 99. 
Howgill, colliery of, produces abundance of fal cathar- 
ticus amarus, p. 482. 
Hunter , Mr. John, his anatomical experiments on birds, 
p. 2ii. His obfervations on the Gillaroo trout, p. 310. 
I. 
Inoculation , its happy effects remarkably inftanced in War- 
rington, p. 440. The general encouragement of this 
practice, for preferving the lives of the poor, recom- 
mended, p. 440. 
■Infcription on an ancient Roman coin, p. 321. 
Ironfide, lieutenant-colonel, his account of the fon or 
fun-plant of Hindoftan, p. 99. 
Ttt 2 
Iron 
