■558 
INDEX. 
fecond brood, p. 261. When the fecond brood are produced, ibid. T!ic fwallow a« 
inftrucHve pattern of indulliy and affcftion, ibid. Refoits where infcdls mod abound, 
ibid. The monop of the mandibles when a fly is taken too quick for the eye, but ths 
fr.ip oftlie bill diflinftly heard, ibid. The male fwallow probably the cxculitor to the 
boufe .and other fmall birds, ibid. He announces the approtich ot birds of prey, when 
all the fvvallows and nnu'iins join in a body, and bulfet their eiien>y from the village, 
p. 261, 262. He alfo founds ihe alarm, and flrikes at cats, p. 262. Each fpccies of 
hirundo drinks as it flies, ibid. The fwallow alone wafhes on the wing, ibid. Swallow 
a delicate fongfter, and bold ranger, ibid. Small parties often attend horfcmen, flying 
around and collcdting infeHs roufed by the horfes feet, ibid. Their food, Ibid. Before 
(heir departure they all forfake houfcs and chimnies, and rooll in trees, ibid. With- 
draw about October, ibid. Some tevv parties haunt the open ibeets of London next 
the fields, ibid. How diftinguifhed fi'om their congeners, p. 263. The moll nimble 
ot all the fpecies, ibid. Want of fagaclty, ibid. See iiand-^lartin. 
ILy, a mountain near Stromnefs in the Orkneys. Its height, p. 13S. 
Hunter, Mr. John, his experiments of the gymnotus eledtricus, p. 393 — 407. See 
Gymnotus Elcdlricus. — His experiments on animals and vegetables, with lelpedt to the 
pt)wer of producing heat, p. 446. See Heat. 
Hutchins, Mr. Thomas, his experiments on the dipping-needle, p. 129. See Dippings 
needle. 
Hygrometer, ftate of the, for the year 1774, at Chlflchurfl, in Kent, p. 294. 
Hyferhpla, redlification of, p. 283 — 287, 
I. 
Jee, the procefs of making It in the Eaft Indies, p. 232. Natural ice never difeovered at 
Calcutta, and but feldom at Allahabad or Mootegil, 232. 255. Methods of making 
ice, p, 232, 233. Remarks on its congelation, p. 254 — 256. 
htgcnhouf%. Dr. John, his experiments on the torpedo, p. i. See Torpedo, i 
Ingkhorough, its height, p. 498. 
Inoculation, remarks on, p. 87. 
JjtJtrument, mufical, an account of one brought from the Ifle of Amfterdam, in the Soutli 
Seas, p. 67. See Mufical Infirument. 
’Journal, meteorological, for the year 1774, kept at the Royal Society’s houfe. 
See Tables.— ‘OtiQ kept at Briftol for the year 1774, p. 194. See Meteorological 
Journal. 
Irritation, a conjefrure that it depends on the gelatinous part of the mufcular fibre, p. 210. 
Our ignorance about if, p. 213. 
L. 
Landen, Mr. John, his Invelllgatlon of a general theorem for finding the length of any 
»rc of any conic hyperbola by means of two elliptic arcs, p, 283—286, Some 
other 
