INDEX 



PAGE 



Academy, French, prizes offered by, 15 

 Accidents, railroad and steamboat, com- 

 pared, 44 

 Acid, fluohydric, vessels for the preser- 

 vation of, 264 

 Acids, citric, tartaric and oxalic, action 



of on cotton and flax fibre, 293 



Acidity and strength of wines, beer, &c., 255 

 Acoustics and ventilation, notes on, 209 

 Affinity, chemical, researches on, 229 



among substances in 



solution, 222 



Africa, Central, natural history of, 351 



Agriculture, British, 271 



Air, influence of on fermentation and 



putrefaction, 249 



AIRT, PROF., on the variation of the 



compass in iron vessels, 154 



Alcohol, concentration of in Sommer- 



ing's experiments, 228 



Aluminum and silicium, deposition of, 235 



two processes for the prepa- 

 ration of, 232 

 Amazon, tropical scenery on, 348 

 American census, curiosities of, 136 

 American gun, new, 339 

 American lakes, dimensions of, 323 

 American Association for the promotion 



of Science, 3 



Ammonia and nitric acid in rain water, 279 

 Ammonia, sal, employment of for the 



prevention of incrustations in boilers, 48 

 Anthracite for locomotives, -V2 



Apes f s. Man, 356 



Architecture, naval, progress of, 29 



thoughts on, 208 



ARNOTT'S smoke-consuming fire-place, 73 

 Arsenic in iron, use of for preventing 



the adhesion of barnacles, 59 



Astronomy, recent progress of, 5 



Atlantic, guano deposits of, 359 



examination of deep sea-sound- 

 ings from, 367 

 Aurora Borealis, orisin of, 144 

 Azote, absorption of by plants, 281 

 BACOX, DR. JOHN, 3G2 

 Bags, loom for weaving, 80 

 BAILEY, PROF., examination of deep 



sea-soundings, 367 



Bandages and splints, wire gauze for, 81 

 Barrels, flour, improvements in the con- 

 struction of, 80 

 Barium, metallic, preparation of, 231 

 Barometers, Cartesian, 190 

 " standard, 189 



PAGE 



Battery, voltaic, extraction of metals by, 230 

 new telegraphic, 147 



application of for the ignition 

 of gunpowder, 143 



Beer, acidity and strength of, 255 



Bismuth, influence of on the ductility of 



copper, 237 



Blood, detection of, 266 



" fountain of, in Honduras, 362 



Boiler explosions, 45 



Boilers, steam, prevention of scale in, 49 



prevention of incrusta- 

 tions in, 43 

 Boiling point of water, definition of, 186 

 Boston water, changes in, 361 

 Boracic acid, production of by volcanic 



action, 263 



Bran of wheat, proximate principles of, 278 

 British agriculture, 271 



British Association, proceedings of, 4 



Bridges, new suspension, 51 



Bronzes, composition of, 243 



Brooms, corn, manufacture of, 80 



Brushes, paint, new mode of manufac- 

 turing, 81 

 Butter, method of examining, 267 

 California, great tree of, 342 

 quicksilver deposits of, 328 

 Candles, improvements in the manufac- 

 ture of, 101 

 Canada, gold deposits of, 325 

 Canosa, antiquarian discoveries at, 330 

 Cane, sugar, extraction of the juice 



from, 102 



Capitol at "Washington, acoustics and 



ventilation of, 209 



Cards, self-stripping, 83 



Carboniferous flora of Ohio, character- 

 istics of, 316 

 CARYL'S flax-cleaning machine, 92 

 Cements, action of sea-water on, 56 

 Census, curiosities of the American, 136 



British, 131 



Cheese, influence of in digestion, 269 



Chemical compounds, dependence of on 

 the electrical character of their con- 

 stituents, 219 

 Chemical compounds, influence of press- 

 ure on the formation of, 297 

 ! Chimney, novel construction of, 123 

 I China, materials in the Great Wall of, 94 

 I Chromium, metallic, 231 

 Clocks, for China and Japan, 93 

 Coal, Albert, 318 

 " fields of Marylar.d, 316 



