Index. 831 



Heat rays compared with rays of sound, ii, 104, 114, 124, 179, 214. 



light ii, 114, 



from warm bodies of same character as from 



the sun ii, 225. 



reflections on ii, 166-187. 



source of, in combustion iii, 31. 



specific, of various bodies ii, 191. 



steam as a vehicle of transporting ii, 324-344. 



supported better by negroes than by whites . . ii, 77, 184. 

 vibratory hypotheses of nature of . . ii, 104, 114, 124, 170- 



184, 214. 



weight ascribed to ii, 1-22, 209. 



Hemp, strength of ii, 33°- 



Historical review of experiments on heat . . . . ii, 188-240. 



Hot and cold are relative terms ii, 103. 



Hottentots, object in besmearing themselves ii, 80. 



House of Correction at Munich, kitchen of (with plate) . . iii, 216. 



House of Industry at Dublin, kitchen of iii, 141. 



Munich iv, 261. 



kitchen of ... . iii, 12-25, 121. 

 Hutton, letter from iv, 691. 



Ice, evaporation of i, 3^7* 



formation of, at bottom of rivers ij 359- 



Illumination, management of light in iv, 99-205. 



Illuminators (with plates) iv, 112, 113. 



for ball-rooms iv, 169. 



dining-rooms iv, 113. 



Incombustible substances mixed with fuel ii, 349. 



Indian corn as food iv, 466. 



cost of iv, 450,468. 



manner of cooking iv, 448. 



pudding, receipts for iv, 460. 



Ingenhousz, experiments on air given off by vege- 

 tables i, 191, i94j 206, 224. 



experiments on conducting power of various 



metals iii, 44* 



Inquiry concerning nature of heat (with plates) . . . ii, 23-130. 

 the source of heat excited by fric- 

 tion (with plates) ii, 469-493. 



