INDEX. 
557 
^eateJ Air. Experiments on the eifecls of air heated to a great degrtee on the living 
human body, p.i 1 3 — 199,463,464.484. Raifes the pulfe, p. 114, 115. 118. 464. 486. 
The Thermometer expofed to air highly heated, finks upon being applietl to the palms 
of the hands, or under the Tongue of a perfon who has continued many minutes' in 
the fame air, p. 1 14, 1 15. 1 18. The living human body fupports air heated to 2 1 1°, 
p. 1 1 7. to 224°, p. 464. to 260°, p. 481. The heated air put in motion intolerable, 
p. 487. Effedls of deaths In enabling the living human body to bear fuch high degrees 
of heat, p. 487. Singular fenfatlons produced by thefe high degrees of heat, p. n8. 
483. Degrees of heat fupportable by the living body very difterent In different media, 
p. 1 19. Experiments on the white of an egg in air heated to 224'’, p. 465. On bees- 
wax in the fame air, p. 466. Experiment on a dog in air heated to 220, p. 489. 
Experiments on fundry Inanimate fubfiances in thefe great degrees of heat, 491, 492. 
Hecla, conjedures concerning, p, 30. 
iiclvodlin and Skidda, height of thofe hills above the intermediate valley, p. 498. 
Henley, Mr. his remarks on an account of the effeds of lightning on a houfe, which 
was furnifhed with a pointed condudor, at Tenterden, in Kent, p. 344. 342. See 
Lightning. 
Hills. Hills Vulcanic. Not generally produced from the bowels of the Earth by fub« 
terraneous explofions, p. io. 27. 
Horizontal vulcanie hills, p. 22. 
Vulcanic Hills of the Vicentine and Veronefe diftrld deferibed. Abound with 
limeftone and lava, p. 24. Without any mixture of Granite, p. 25. Orlg'mal 
ifrudure and charaders of thefe hills, before they were changed by fire, Hill evi- 
dent, ibid. 
Vulcanic Hills near Coffovo in Dalmatia, p. 34. In the county of Down In Ire- 
land, ibid* 
Hirundines, Britilh. See Honje-Smillom^ Swiji^ and Sand-Martin. 
Horjley, Rev. Dr. his abridged ftate of the weather at London in the year 1774, coU 
leded from the meteorological journal of the Royal Socletyi p. 167. See iVedthen, 
De polygonis area vel perimetro maximis et minimis, inferiptis circulo, vel clr- 
culum circumferibentibus, p. 301—310. Thorenia 1 , 11 , III, IV, V, Vl* 
Hor-wich, in Lancafhlre^ furvey of its inhabitants, in the year 1773, with the llate of 
births and deaths, 43 1 , «* 
Houfe- Svsallovs, account of the, p. 358. The firfl: comer of i\\o hirundines, ibid. 
Appear about the middle of April, about lakes and mill-ponds, ibid. Their with- 
drawing for a time if they find froft and fnow, more in favour of hiding than mi- 
gration, p. 258, 259. Build their nefis in various places, p. 239. Nells deferibed, 
p. 259. 260. Dam fubmits to an inconvenient fituation to fecure her brood, p. 260, 
What number of eggs they lay, their colour, and time of hatching, ibid. Progref- 
five method of introducing their young into life, p. 260, 261, The firlt brood con- 
gregates with the firll brood of houfe-martins, and the dam begins the bufinefs of a 
6 ’ fecond 
