The Chemical Gazette, Volume 61848 - Chemistry |
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Common terms and phrases
acetate of lead acetic acid æther afforded alcoholic solution alkali ammonia amount analysis anhydrous antimony arsenic arsenious acid asparagine atoms baryta bile boiling Carbon Hydrogen carbonic acid caustic potash cent Chem chloride of ammonium chromic acid chromium cold colour colourless composition compound concentrated contained converted cooling copper crystalline crystals decomposed decomposition deposited dilute disengaged dissolved distillation dried at 212 equivs evaporation excess experiments filtered formed formula furnished grms heat hydrate hydrogen insoluble iron lime liquid magnesia mass mercury metallic mixed mixture muriatic acid neutral nitrate of silver nitric acid nitrogen numbers obtained odour oxide oxide of lead Oxygen perchloride peroxide phosphate phosphoric acid platinum PO³ portion potassium powder precipitate produced protoxide pure pyrophosphate reaction readily residue resin santonine saturated selenious acid separated soluble in water substance sulphate sulphuretted hydrogen sulphuric acid temperature tetrathionic tion tube urea urine vapour volatile washed yellow zinc
Popular passages
Page 346 - ... salt in each pint is, in its continued use, an effectual poison to the weaker forms of vegetation ; or that when a soil is continually watered with a weak solution of salt, it gradually accumulates in it until the soil becomes sufficiently contaminated to be unfit to support vegetable life. In either case an interesting subject of inquiry is suggested — What is the weakest solution of salt which can produce in any measure this, poisonous effect ? — or, in other words, at what degree of dilution...
Page 345 - ... greenhouses (but all in pots) which exhibited, in a greater or less degree, the same characteristics. The roots were completely rotten, so as to be easily crumbled between the fingers ; the stems, even in young plants, assumed the appearance of old wood ; the leaves became brown, first at the point, then round the edge, and afterwards all over ; while the whole plant drooped and died.
Page 346 - Further inquiry showed that the well from which the water was procured had an accidental communication, by means of a drain, with the sea, and had thus become mixed with the salt water from that source, and had been used in this state for some weeks, probably from two to three months. From about that time the plants had been observed to droop, but it was not until nearly the whole of a valuable stock had been destroyed that any extraordinary cause of the evil was suspected. To place it beyond doubt...
Page 360 - ... from three-quarters of an inch to an inch and a half in length, and more or less irregularly ovoid.
Page 384 - By moderate pressure, the spongy gold becomes a solid mass and burnishes quite brilliantly. The jeweller or goldsmith will find spongy gold to be quite convenient when he requires it for a solder, and it is a convenient form of the metal for making an amalgam for fine gilding. I have used it for some years in soldering platina, and prefer it to the filings or gold foil for that purpose. This method of separating fine gold from coarse, is very simple, and cheaper than the usual processes. It is applicable...
Page 258 - After the manna has been removed from the trees, it has further to be dried upon shelves before being packed in cases. The masses left adhering to the stems after removing the inserted leaves are scraped off, and constitute the Manna cannelata in fragmentis.
Page 347 - The author proceeds to examine all the sources from which the air or the water can be contaminated. The various manufactures of large towns, the necessary conditions to which the inhabitants are subjected, and the deteriorating influences of man himself are explained. If air be passed through water a certain amount of the organic matter poured off from the lungs is to be detected in it. By continuing this experiment for three months, Dr, Smith detected sulphuric acid, chlorine, and a substance resembling...
Page 347 - Waterworks contains only 1-43 per cent, of organic matter, after being used for weeks. In 1827, Liebig found nitrates in twelve wells in Giessen, but none in wells two or three hundred yards from the town. Dr Smith has examined thirty wells in Manchester, and he finds nitrates in them all. Many contained a surprising quantity, and were very nauseous. The examination of various wells in the metropolis shewed the constant formation of nitric acid; and, in many wells, an enormous quantity was detected.
Page 390 - CoUodion thus prepared possesses remarkably adhesive properties. A piece of linen or cotton cloth covered with it, and made to adhere by evaporation to the palm of the hand, will support, after a few minutes, without giving way, a weight of from twenty to thirty pounds. Its adhesive power is so great, that the cloth will commonly be torn before it gives way.
Page 222 - Brodie found that it constituted 22 per cent, and it was always present in European samples, while in Ceylon wax it was entirely absent. This curious variation in the nature of an animal secretion, under different conditions of life, resembles the variations sometimes noticed in the acids of butter...