INDEX. 



Steam, latent heat of, J^t 



»- I.. .^ .. engines* method of eftimatlng 

 their value in horfe powers, 214 



Steel, cxpanfion of by heat, 230. — Method 

 of communicating its properties to cop- 

 per, 267 



Straufs on a method of coating copper with 

 platina, 303 



Stream of water, ftrudlure for purifying 

 a, 96 



Striking part for a clock, new, 92 



Sturm, 283 



Sugar, is a generic term, 70.— Contains 

 the principles of bees' wax, 191.— Ex- 

 periments on its power of abforbing »t- 

 mofpheric air, 261 



Sulphates of cerium, 295, 296 



Sulphur, on the latent heat of, 45.— Ex- 

 periments on its power of abforbing at- 

 mofpherlc air, 261 



Sulphuret, triple of lead, antimony and 

 copper, analyds of, 14 



Swammardam, 182 



Sylvefter, Mr. on the operation of the gal- 

 vanic power, 179 



T. 



Tables of fquarei and cubes, computation 



•f, 4, 123 

 Tallow, defcription and drawing of a lamp 



for burning, 145 

 Tan, experiment on its union with ftarch, 



75 



Tartrite of cerium* 300 



Temperature is deprefled by the radiation 



of cold bodies, 194 

 Teflier, 142 



Thickncfie, Ra. Efq. on galvanifm, 120 

 Theolden, M. on a new planet, 301 

 Thomfon, Dr. 17. — On pepper, 68, 211 

 Thouvenal, 42 



Tin, on the latent heat of, 45 

 Tingry, M. on his errors refpefting copal 



varniflies, 151 

 Torpidity of animals iti winter, prize qu^f- 



tion refpefting, 141 



Tromfdorff, on obtaining pure cobalt, 303 



Troughton, Mr. E, defcription and draw- 

 ing of his tubular pendulum, 225.— His 

 mercurial pendulum perfedlj but not 

 portable, 229 



Tungftein, new metal found In a fuppofed 

 ore off 290 



Turpentine, procefs for diflblvlng copal la 

 fpirit of, 154.— 19 a better menftruum 

 than alcohol, 155 



Van Mens, 22 i 



Vapour, aqueous, its aftion dn Water, jii 



Varnifh, copal, letter from Mr. T. Shel- 

 drake on, 151. — Safe and eafy method 

 of making, 157 



fpirit facilitates the paflage of 



heat, 61 



Vauquelin, 37.— -His analyfis of a liquor 

 employed to render fluff's Impermeable 

 to water,, 252 



Veau de Launay, on an accident with ful- 

 minating fiiver, 203 



Vegetables, loofe nomentlature of, 69.— 

 Prize queftion refpefting the fources of 

 carbon in, 141. — Die In azote for want 

 of their proper ftimulus, 219.— On the 

 mucilaginous powders obtained from 

 fome, as fubftitutes for gum Arabic, 232 



Vegetation, on the neceflity of atmofphe- 

 rlcal oxigen in the procefs of, 217 



Vibration injures the artlculateuefs of 

 found, 284 



W. 



Walker, Mr. E. on the apparent fize of 

 the horizontal moon, 164.— Examina- 

 tion of his theory, 235 



Water, Prof. Parrot's machine for filtering, 

 40. — Its aftion on pepper, 70.— Is not 

 a folvent of ftarch, 74. — A£tion of 

 aqueous vapour on, 90.— On the puri- 

 fication of, by filtration, 95. — Maxi- 

 mum of its denfity, 112. — Compofition 

 of, I20.'—Enquiry into the aftion of 

 galvanifoi 



