838 Index. 



Roasting ovens iii, 308 



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



theory of combustion of gunpowder ij 43 



force of fired gunpowder .... i, 108, i6g 



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, 4S6 



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 seerwoods 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 



