[ « 4 a ] 
Hutchins (Thomas), Efq. Ms account of the fuccefs of fome attempts to freeze qulcft- 
iilver at Albany Fort, in Hudfons Bay, p. 174. See Quickfilver. His obfervationi 
on the dipping-needle, p. 179— -181. 
liutitn (Charles), Efq. his new and general method of finding fimple and quickly- 
converging feries ; by which the proportion of the diameter of a circle to its cir- 
cumference may eafily be computed to a great number of figures, p. 476. See 
Circle. His demonllration of two theorems mentioned in Article XXV. of the 
Philofophical Tranfa&ions for the year 1775, p. 600 — 603. 
Hyacinth, a remai kable one in the fouthern part of Africa, p.503. 
Hygrometer, belonging to the Royal Society, concerning it, p. 385. 
L 
Ice from the fea, produces frcfli water, p. 374. 
Ignition, of the light produced by it, fee Light. Experiments on ignited bodies, p. 
509—512. 575 — 577 - 
lnflammaticn , of the light produced by, p. 504. See Light. 
Ingenhoufz (Dr. John), his eafy methods of meafuring the diminution of bulk, taking 
place upon the mixture of common and nitrous air; together with experiments on 
Platina, p. 257. See Air. Platina. 
Injhuments, meteorological, an account of thofe ufed at the Royal Society’s houfe, p. 
375. See Meteorological Ivjlrumemts. 
Intejlines, wounded, an extraordinary cure of, 426 — 438. 
Journal, meteorological, for the year 1775, and part of 1776, kept at the houfe of 
the Royal Society, p. 319, See. See Tables. An abridged Hate of the weather col- 
lected therefrom, p. 354, &c. See Weather. 
Jpecacoanha, violent ailhmatic fits Occafioned by the effluvia of, p. 168. 173. See AJib- 
matte Fits. 
host, particles of foft iron give evident figns of two diftinCt poles, p. 266. Iron filings 
mixed with bees-wax, being touched with magnetical bats, have the qualities of a 
magnet, p. 267. Granulated iron ore of Sweden a tolerable good magnet by being 
touched with the bars, ibid. Concerning an error in Mr. BuflWs account of the 
weight of iron when heated, p 509 — 51A 575 577* 
Iron Ore, lately found in Siberia, an account of it, p. 523. An account of the place 
and circumftances in which this mafs of native iron was found, p. 524 — 526. 
Natural Hate of the iron* p. 526,527. Obfervations concerning this mafs of iron, 
p.527,528. 
Iron Wire, conducts electrical fluid 400 million times better than rain or dillilled w'ater, 
p. 198. 
Jfis hippuris, remarks concerning it, p. 4, 5. 
jjling/tn , an extraordinary electricity of the atmofpherc obferved there, in the month 
of October 1775, p. 407. See Elellricity. 
Italy, 
