838 Index. 



Roasting ovens iii, 308. 



Robins's methods of determining velocities of bullets . . i, 6. 



theory of combustion of gunpowder i, 43. 



force of fired gunpowder .... i, 108, 169. 



Rooms, salubrity of warm iv, 567-581. 



steam-stove for warming iii, 382. 



Royal Institution, lighting of iv, no. 



proposals for forming iv, 739-770. 



prospectus of iv, 771-785. 



Rumford's works, list of iv, 796. 



Rye-bread iv, 489. 



experiments on baking iv, 529-541. 



SAFETY-VALVES for steam-boilers ii, 332 ; iii, 486. 



Salt, crystallization of i, 390. 



Salt-fish, cooking of iii, 188. 



Salubrity of warm bathing iv, 583-613. 



rooms in cold weather . . . . iv, 567-581. 



Sap, theory of its not freezing in winter i, 263. 



and air in trees and seenvoods ii, 441. 



Saucepans and stewpans, construction of . . iii, 348-359, 369. 

 Scheele's theory of light produced in combustion . . . . i, 201. 



Sea, cooking at iii, 149. 



final cause of saltness of i, 326. 



Semen Lycopodii, conducting power of i, 454. 



Senebier's experiments on effects of light i, 369. 



Shadows, experiments upon coloured iv, 49-62. 



influence of, on distinct vision iv, 105. 



Silver reduced by charcoal iv, 86. 



essential oils iv, 91. 



horn, reduced by light i, 372. 



Silvering of ivory . iv, 95. 



Smoke, cause of ascent of ii, 533. 



Smoke-jacks, observations on iii, 227. 



Smoking chimneys, cause of iii, 485, 537. 



cure of ii, 486. 



Snow in economy of nature i, 464. 



Soap, use of steam-heat in making ii, 358. 



Society for Bettering the Condition of the Poor, etc., com- 

 munications with iv, 751. 



