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The effect of an artificial supply of ammonia, as a source of nitrogen, is, therefore, precisely analogous to that of humus as a source of carbonic acid it is limited to a gain of time; that is, it accelerates the development of plants.
It would seem as though carrion liquefaction, deadly to any other stomach, were in this case a food productive of special energy, which stimulates the organism and accelerates its growth, so that the fare may be consumed before its approaching conversion into mould. Living chemistry makes haste to outstrip the ultimate reactions of mineral chemistry.
Caffein first accelerates the heart and later may slow it and strengthen it; but if the dose is large or too frequently repeated, the apex of the heart ceases to relax properly and there is an interference with the contraction of the ventricles, the heart muscle becomes irritable, and a tachycardia may develop.
The excitement of fear in the mind still more accelerates heart action and respiration, intensifies the local congestion and greatly increases the morbid accumulations in the system.
The cold-water treatment makes the skin more alive and active, stirs up and accelerates the circulation throughout the system and thus promotes the elimination of systemic poisons through the skin. This stimulating effect of cold water upon the organism has been proved by counting the number of red blood corpuscles in a drop of blood before and after the application of the cold "blitzguss."
We know that the two invariably go together, so that we are right in concluding that the same cause produces both. It might be thought that heat is the cause, but the same changes take place more slowly in the cold, so we can only say that heat accelerates the action, and hence must conclude that the prime cause is one of the materials in the emulsion itself.
Weights also thrown cleave the air and dissipate it, as they fall with force; the air recoiling back, according to its proper tendency to rush in and fill the vacuum, follows the impulse, and accelerates the motion. The fall also of thunderbolts is like to darting anything.
Ammonia certainly favours, and accelerates, the growth of plants in all soils, wherein all the conditions of its assimilation are united; but it is altogether without effect, as respects the production of the elements of blood where any of these conditions are wanting.
"I shall have to speak to Parkes about this engine," I said. "The controls don't work properly, and she accelerates much too quickly." But the Captain saw the ruin of the liqueur bottle lying by the roadside, and was not in the mood for amusement. So we rode in silence down the hill, while the flames of Ypres gleamed and flickered in the distance.
She had a letter from Mabel telling her of Mr. Urquhart's feats in the hunting field.... "He's quite mad, I think, and mostly talks about you and Lancelot. He calls you Proserpine. As for his riding, my dear, it curdles the blood. He doesn't ride, he drives; sits well back, and accelerates on the near side. He brought his own horses, luckily for ours and his neck. They seem to understand it.
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