r 455 ] 
H. 
Hamilton, Sir William. See Iron Works. 
Bearing, Account of the organ of, in fifh, by John Hunter, Efq. p. 37g . when Mr.. 
Hunter fir ft obferv'ed this organ, p. 380. Nothing more eafy than the expofure of 
this organ of fifh in general, ibid. Its defcription and fituation in different fi,h, p. 381. , 
et feq. Much more fimple in fifh than in the fuperior orders of animals, ibid. An- 
experiment, {hewing that founds aifbd them much, p. 38% 
Heat . See Thermometer. 
Heckingham. See Lightning. 
Hellins , rev. John. See Equation. 
Hemp-feed , Chinefe. Surprizing vegetation of fome feeds fown two months after the 
proper feafon, p. 47. Defcription of the plants, ibid. Manner of preparing the 
plants for the produdion of hemp, ibid. Defcription of the plants when ftripped, 
p. 48. Amazing weekly increale in length, ibid. Great advantages expeded front 
the cultivation of this plant, through the patronage of the Society for the Encou- 
ragement of Arts, &c. ibid. 
Herfcbel, William. A paper to obviate fome doubts concerning the great magnifying 
powers ufed by him, p. 173. His prefent method of determining thole powers, p. 17^ 
His former method of determining thofe powers, ibid. Defcription of a camera-eye- 
piece, made for that operation, p. 176. Advantages and inconveniences attending 
each method, ibid. - See Fixed Stars , Double Stars , I- cvr,p- Hero meter . 
Holy Crofi , Salop.- Extrad of the regifter of the pari fh of, p r 53. An adual furvey 
made in the year 1780, p. 54. Difeafes aud Cafualties from 1770 to 1780, p. 
Number of inhabitants adually furveyed every five years for thirty years, ibid. Rea- 
fons of the increafe and decreafe of the inhabitants in particular years, ibid. p. 56. 
An account of the marriages in this parifli can be of no ufe in political arithmetic* 
and why, p. 56. And the public regifter is too general for fuch pttrpofcs, p. 57. 
Book. See Fixed Stars. 
Hunter , John. See Hearing. 
Infinite feries. A new method of inveftigating the fums of, by the rev. Samuel Vince, 
M. A. p. 389. Part I. containing a new and general method of finding the fum of 
thole feries which De Moivre has found in one or two particular cafes; but whofe 
method, although it be in appearance general, will, upon trial, be found abfolutely 
impraditable, p. 390— -40 j. Part II. containing the fummaiioa of certain feries, 
