The Year-book of Facts in Science and Art

Voorkant
James Mason
Simpkin, Marshall, and Company, 1855
 

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Pagina 224 - ... both consumed by a given weight of animal within a given time, and required to yield a given weight of increase. The...
Pagina 202 - It may appear to some that the chemical character which has been assigned to osmose takes away from the physiological interest of the subject, in so far as the decomposition of the membrane may appear to be incompatible with vital conditions, and that osmotic movements must therefore be confined to dead matter ; but such apprehensions are, it is believed, groundless, or, at all events, premature. All parts of living structures are allowed to be in a state of incessant change, of decomposition and...
Pagina 117 - ... most luxuriantly in elevated and dry regions. The gum exudes spontaneously, in a semi-fluid state, from the bark of the trunk and branches, and soon hardens by exposure to the atmosphere, forming more or less rounded and variously- colored masses, weighing each from a few grains to several ounces.
Pagina 200 - These are surpassed by the stronger mineral acids, such aĽ sulphuric and phosphoric acid, and sulphate of potash ; which are again exceeded by salts of potash and soda, possessing either a decided acid or alkaline reaction, such as binoxalate of potash, phosphate of soda, and carbonates of potash and soda. The highly osmotic substances were also found to act with most advantage in small proportions, producing in general the largest osmose in the proportion of one-quarter per cent, of salt dissolved....
Pagina 223 - Fuchs's method is as follows :{ — " ' Clean and washed quartz-sand is mixed with the smallest quantity of lime which will enable the plasterer to place it on the wall. The surface is then taken off with an iron scraper, in order to remove the layer formed in contact with the atmosphere ; the wall being still moist during this operation. The wall is then allowed to dry ; after drying it is just in the state in which it could be rubbed off by the finger. The wall has. now to be fixed, ie, moistened...
Pagina 78 - ... to be made of sheet iron. In Martin's new Jacquard machine, the object had been to substitute for the heavy cards, a sheet of prepared paper punched with given apertures, like the cards of the old machines, but instead of being a series of pieces...
Pagina 200 - ... travels in the electrical decomposition of pure water, and resolves itself into hydrogen gas and water at the negative pole, causing the accumulation of water observed there, while the oxygen alone proceeds in the opposite direction to the positive pole. Attention was also called to the fact, that acids and alkalies, when in solution, are chemically combined with much water of hydration ; sulphuric acid, for instance, evolving heat when the fiftieth equivalent of water is added to it. In the...
Pagina 224 - ... consumed by a given weight of animal, within a given time, and the amount of increase obtained from a given weight of food.
Pagina 201 - Such millimetre divisions of the tube become degrees of osmose, which are of the same value in all instruments. Osmose in membrane presented many points of similarity to that in earthenware. The membrane is constantly undergoing decomposition, and its osmotic action is inexhaustible.
Pagina 290 - Parish Churches; being Perspective Views of English Ecclesiastical Structures ; accompanied by Plans drawn to a Uniform Scale, and Letterpress Descriptions. By R. and JA BBANDON, Architects.

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