THE CHEMICAL GAZETTE, OR, JOURNAL OF PRACTICAL CHEMISTRY IN ALL ITS APPLICATIONS TO PHARMACY, ARTS AND MANUFACTURES

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Pagina 396 - ... both consumed by a given weight of animal within a given time, and required to yield a given weight of increase. The...
Pagina 278 - Ox bladder was found to acquire greatly increased activity, and also to act with much greater regularity when first divested of its outer muscular coat. Cotton calico also impregnated with liquid albumen, and afterwards exposed to heat so as to coagulate that substance, was sufficiently impervious, and formed an excellent septum, resembling membrane in every respect. The osmometer was of the usual bulb-form, but the membrane was supported by a plate of perforated zinc, and the instrument provided...
Pagina 280 - ... 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 renewal. The decomposition occurring in a living membrane, while effecting osmotic propulsion, may possibly therefore be of a reparable kind. In other respects chemical osmose appears to be an agency particularly adapted to take part in the animal oeconomy.
Pagina 277 - Lime and alumina were accordingly always found in solution after osmose, and the corrosion of the septum appeared to be a necessary condition of the flow. Septa of other materials, such as pure carbonate of lime, gypsum, compressed charcoal and tanned sole-leather, although not deficient in porosity, gave no osmose, apparently because they are not acted upon chemically by the saline solutions.
Pagina 277 - ... inch in diameter, attached to the mouth of the cylinder by means of a cup of gutta percha. In conducting an experiment the cylinder was filled with any saline solution to the base of the glass tube, and immediately placed in a large jar of distilled water ; and as the fluid within the instrument rose in the tube, during the experiment, water was added to the jar, so as to prevent inequality of hydrostatic pressure. The rise (or fall) of liquid in the tube was highly uniform, as observed from...
Pagina 276 - Dutrochet when filled with a saline solution and immersed in water,) the passage of the salt outward is entirely by diffusion, and that a thin membrane does not sensibly impede that molecular process. The movement is confined to the liquid salt particles, and does not influence the water holding them in solution, which is entirely passive : it requires no further explanation. The flow of water inwards, on the other hand, affects sensible masses of fluid, and is the only one of the movements- which...
Pagina 153 - ... tint. To produce the former, it is only necessary to wash the article with a solution of sal-ammoniac ; a much more beautiful tint may, however, be obtained by employing a solution composed of equal parts of sulphate of copper and sal-ammoniac in vinegar. The fine black tint may...
Pagina 280 - The natural excitation of osmose in the substance of the membranes or cell-walls dividing such solutions, seems therefore almost inevitable. In osmose there is, further, a remarkably direct substitution of one of the great forces of nature by its equivalent in another force — the conversion, as it may be said, of chemical affinity into mechanical power. Now what is more wanted in the theory of animal functions than a mechanism for obtaining motive power from chemical decomposition as it occurs...
Pagina 238 - ... whilst the quantity is -very large when their feathers are fully developed. The question naturally suggests itself, what becomes of the uric acid in the former case ? May it not be transformed by some as yet unknown metamorphosis in the animal body into a substance like alloxan, capable of...
Pagina 112 - The solution gelatine is prepared by digesting 10 grms. of dry gelatine (containing about 18 or 19 per cent, of water) in water for twelve hours, and then applying heat until the solution is complete. The volume is then made up to 1 litre. For the purpose of determining the centigrade value of the gelatine solution, 0.2 grm.

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