The Chemist, Volume 6R. Hastings., 1845 - Chemistry |
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acetate action alcohol alkaline alumina ammonia analysis animal appears arsenic ascertained atoms baryta blood body boiling calcined carbonate of soda carbonic acid cent chemical chemists chloride color combination combustion composition compound contained crop crystallised crystals decomposed decomposition digitaline diluted disease disengaged dissolved distilled dose dried effect employed equivalents ether evaporated experiments extract fecula filtered formed formula gave grains grammes guano heat hydrate hydrochloric acid hydrogen iron lactic acid lead lime liquid liquor magnesia manner manure mass matter ment mercury metallic mixed mixture nitrate nitric acid nitrogen observed obtained odor organic oxalic oxalic acid oxide oxygen phosphate phosphoric acid plants platinum poison portion potash potassa powder precipitate prepared present produced proportion protoxide pure reaction residue salt silica silver small quantity soil soluble solution stomach substance sugar sulphate sulphuret sulphuric acid tained temperature tincture tion tube urine washed weight zinc
Popular passages
Page 336 - AND COLLATERAL INFORMATION IN THE ARTS, MANUFACTURES, PROFESSIONS, AND TRADES, INCLUDING MEDICINE, PHARMACY, AND DOMESTIC ECONOMY ; designed as a General Book of Reference for the Manufacturer, Tradesman, Amateur, and Heads of Families.
Page 195 - ... for gravitation is a property of matter dependent on a certain force, and it is this force which constitutes the matter. In that view matter is not merely mutually penetrable, but each atom extends, so to say, throughout the whole of the solar system, yet always retaining its own centre of force.
Page 449 - ... for several hours ; they are then removed, and steeped in a strong solution of tannin for twelve hours; after which they must be wrung out and thoroughly dried. This process may be repeated, or not, according to the depth of color required ; and the usual process of dyeing may be proceeded with in the ordinary way.
Page 408 - The diffusion of the light thus occasioned shaded off, as it were, all the sharp lines and points, and gave a high degree of softness to the picture. The effect was even improved by interposing two sheets of clean paper; and, with a very bright meridian sun, he found that three sheets may be used with advantage. A similar effect may be obtained, in a smaller degree, by placing the back of the negative upon the positive paper, so as to cause the light to traverse the thickness of the negative, and...
Page 452 - The most accurate experiments and analyses have pointed out that the excrements of man and animals contain those substances, to the presence of which the fertility of the soil is due. The fertilizing power of manure can be determined by weight, as its effect is in a direct ratio to its amount in the mineral elements of the food of plants.
Page 266 - The blacks are first sent through the forest, armed with a quantity of soft clay, and a small pickaxe. On coming to one of the trees, a portion of the soft clay is formed into a cup and stuck to the trunk. The black then striking his pick over the cup, the sap oozes out slowly, a tree giving daily about a gill. The tapper continues in this way, tapping perhaps fifty trees, when he returns, and with a jar, passing over the same ground, empties his cups. So by seven o'clock the blacks came in with...
Page 397 - The velocity of air being !•, the velocity of oxygen was found to be -9500 by experiment, and by calculation -9487. Carbonic acid, being much heavier than air, gave the number -812. Carburetted hydrogen gave -1322 as the velocity of its effusion. Hydrogen gave as the velocity of effusion 3-613 by experiment, which was very nearly the amount given by theory. The interference of friction, even of minute orifices, was then described, and shown to admit of easy correction. Some useful applications...
Page 451 - The duration of the fertility of a field depends on the amount of the mineral aliments of plants contained in it, and its productive power for a given time is in a direct proportion to that part of its composition which possesses the capacity of being taken up by the plant.
Page 195 - And in the latter, besides the seven hundred atoms, there will be an equal number of aqueous and oxygenous atoms, in all two thousand eight hundred ponderable atoms. It follows that if the atoms of potassium are to be considered as minute impenetrable particles, kept at certain distances by an equilibrium of forces, there must be, in a mass of potassium, vastly more space than matter. Moreover, it is the space alone that can be continuous. The noncontiguous material atoms cannot form a continuous...
Page 408 - ... of silver, and which is to receive the positive picture. In strong sunlight the picture is thus taken very quickly, but there is a roughness in the shades, owing to the formation of black specks, which destroys the softness of the picture, and in portraits gives a disagreeable harshness to the human face.