INDEX. 



Huygens, 114, 148. 



Hydrometer, defcription of Speer's, 63 



Ice, a worfe conductor of heat than wa- 

 ter, 3 1 



Iceland ciyftal, on the oblique refraction 

 of, 148 



Immerfion of feeds, advantages of, 281 



Inflammable Substances dangerous in the 

 vicinity of phofphoric preparations, 217 



Information, miscellaneous, 220 



Inks, Sympathetic, not to be depended 

 upon in fecret writing, 246 



Intercalation, method of fecret writing by, 

 249 



Inventions important, at firft considered to 

 be trifling, 69 



Joint for metallic tubes, 5. — Early inven- 

 tion of, 107 



Jordan, Mr. 182 



Iron cannot decompofe fixed air, 67 



Irfon, Thomas, 70 



Irvine, Dr. 221 



Jumilhac, Cit. his eafy method of churn- 

 ing, 241 



K. 



Kant, 233 

 Kircher, 246 



Kirwan, Dr. 20, 53. — On the declivi- 

 ties of mountains, 256 

 Klaproth, 7, 54, 208 

 Jtlingenftiern, 1:1 

 Knight, Mr. 245 



L. 



Labat, 254 



Lagrange, his theory of grave harmonics, 



72, 142 

 Lametherie, 258 



Languages, organ of knk for, 232 

 La Place, 221 

 Lavater's phyfiognomy, 197 

 Lavoifier, 139, 221 



Lee, Mr. Stephen, 144 



Leindenfroft, M. 207 



Lemonier, 188 



Lepage- Du prat, 189 



Le Sage, 61, 274 



Leferme,,i89 



Liberality, organ of, 232 



Life, organ of tenacity of, 201 



Light, on the difperfion of, 94.— Difoxi- 

 genating rays of, 100.— Appearance of 

 in vacuo, 103. — Laws respecting two 

 portions arriving by different courfes, 

 180 — Coloured fringes produced by dif- 

 ferent media, 182 



of candles, quantities produced by 



different Sizes, 40. — Curious effects of 

 the refraction of, 100.— Subdivifion of, 

 186 



" of electricity, refraction of the, 



Liming of wheat recommended, 282 



Linnaeus, 188 



Liquors, fpirituous, on the fpecific gravi* 



ties of, 285 

 Loadstone, its effects known to jugglers 



before it was applied to navigation, 69 

 Locality, organ of the fenfe of, 229 

 Lock, construction of one for raifing and 



lowering veffels, 236. — Advantages of, 



238 

 Love of glory, organ of, 228 



■ truth, organ of, 228 



Ludlam, 218 

 Lulolph, 257 

 Luminous appearances by friction, 105 



M, 

 Machine, Speaking, 70. — For rooting up 



the flumps of trees, 243 

 Macquer, 274 



Magazine-piftol, defcription of, 250 

 Magellan, 222 

 Magnitude of objects, rules for emulating 



the diftance by, 118 

 Malic acid in ants, 284 

 Marian, 188 

 Marmots, queftion respecting, 278 



Marfha), 



