The Chemical Gazette, Volume 12


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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 379 - The author has in several cases observed the excretine to crystallize directly in the alcoholic solution of faeces before the addition of lime, and has scarcely any doubt that it exists for the most part in a free state in the excrements, and constitutes one of their immediate principles. As to its source, he observes that it appeared in excess when a considerable quantity of beef had been taken, and in less than the usual quantity in a case of diarrhoea attended with loss of appetite ; but none...
Pagina 380 - The aethereal solution, after being well washed with water to remove mineral acid, yields the pure excretolic acid on evaporation. This body is of an olive colour; it fuses between 25į and 26į C., and at a higher temperature burns without residue. It is insoluble in water and in a boiling solution of potash ; very soluble in aether, sparingly soluble in cold alcohol, readily so in hot ; its solutions having a marked acid reaction.
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 ceconomy.
Pagina 215 - Several reactions, however, were mentioned as tending to show that there, is some truth in the law : — for instance, the solution of gold in hydrochloric acid upon the addition of nitrate of potash. The experiments of Bunsen on mixtures of carbonic oxide and hydrogen, exploded with a quantity of oxygen insufficient for complete combustion ; and those of Debus on the precipitation of mixed hydrates of lime and baryta by carbonic acid, were explained ; as also the remarkable fact noticed by both,...
Pagina 337 - CCORDING to the results of recent researches in the constitution **• of salts and the methods thence introduced of explaining chemical reactions, it is equally correct to represent such a reaction as that of hydrochloric acid on hydrate of potash, as consisting in an exchange of hydrogen of the one for potassium of the other, or of chlorine in one for peroxide of hydrogen in the other. In Mr. Kay's researches as described in the following brief outline, this notion has obtained very striking illustration...
Pagina 279 - The most general empirical conclusion that can be drawn is, that the water always accumulates on the alkaline or basic side of the membrane. Hence, with an alkaline salt, such as carbonate or phosphate of soda, in the osmometer and water outside, the flow is inwards ; but with an acid in the osmometer, on the contrary, the flow is outwards, or there is negative osmose, the liquid then falling in the tube.
Pagina 235 - So readily is this body formed, that a solution of alloxan will stain the skin purple in consequence of its production. This fact led its second discoverers to imagine that, like the Tyrian purple, it might be employed as a dye-stuff. The difficulty, however, of obtaining it, and of fixing it upon the fabric when formed, prevented for that time the idea from proving fertile. Some time since, however, Dr. Sacc turned his attention to the subject, and led by the fact above mentioned, that a solution...
Pagina 238 - How curious if it should hereafter be found that murexide was indeed the source of all the varied hues of birds' plumage ! Still further, it is chiefly those animals which have but one means of exit for their excrements, and who produce large quantities of uric acid, that exhibit a display of colouring.
Pagina 219 - 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 re> move the layer formed in contact with the atmosphere ; the wall being still moist during this operation.

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