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Updated: June 11, 2025
Siemens had been trained as a mechanical engineer, and, although he became an eminent electrician in later life, his most important work at this early stage was non-electrical; indeed, the greatest achievement of his life was non-electrical, for we must regard the regenerative furnace as his MAGNUM OPUS. Though in 1847 he published a paper in Liebig's ANNALEN DER CHEMIE on the 'Mercaptan of Selenium, his mind was busy with the new ideas upon the nature of heat which were promulgated by Carnot, Clayperon, Joule, Clausius, Mayer, Thomson, and Rankine.
Judicious boiling accomplishes this: and we cannot do better than to follow Liebig's plan to first plunge the meat into boiling water, and boil it five minutes to coagulate the albumen to a sufficient depth to form a crust upon the surface, and thus confine the juices, and then add enough cold water to reduce the temperature to 158° Fahr., if the meat is to be rare, or to 165° Fahr., if it is to be well done; and to maintain this gentle heat until the meat is tender.
Herbert thinks that it would be most desirable to send, if possible, a provision of portable food, such as Liebig's extract of meat, as near to Paris as possible; so that, whenever the siege ceases, it may at once be brought into the town, as otherwise it is very probable that many of these English will die of starvation before food can reach them.
He consequently modified his formula, and gave the following as the composition of atropine; C H NO . Liebig's amended analysis was afterward confirmed by Planta, who further showed that the alkaloid itself melted at 194 deg. F., and its double gold salt at 275 deg. F. It is worthy of remark that the first figure was considered correct until my researches proved the contrary.
The gas furnished the requisite heat, and the provision chest supplied the materials for their first repast. They commenced with three plates of excellent soup, extracted from Liebig's precious tablets, prepared from the best beef that ever roamed over the Pampas.
Liebig's researches, e.g. into the Contagious Influence of Chemical Action, and his Theory of Respiration, are among the finest examples, since Newton's exposition of the law of gravitation, of the use of the deductive method for explanation. But the method is as available for explaining mental as physical facts. It is destined to predominate in philosophy.
"Thank God for that," Ralph said. Three hours later the farmer returned, with a bottle of medicine, some arrowroot, lemons, a bottle of wine, some Liebig's essence of meat for making broth and a message that the English surgeon would ride over, as soon as he could get away.
I allude to the investigations of the Baron Freyherr von Reichenbach, published in Wohler and Liebig's "Annals of Chemistry," and already translated for the benefit of the English reader, and familiar to the reading public.
Notwithstanding Liebig's belief to the contrary, the idea that the decomposition of sugar during fermentation is intimately connected with a development of the cellules of the ferment, or a prolongation of the life of cellules already formed, is in no way opposed to the fact that the ferment is capable of bringing about the fermentation of a pure solution of sugar.
The flask is heated in a water-bath, and the vapours condensed by a Liebig's condenser. In the case of phosphorus the condenser should be of glass, and the process of distillation conducted in the dark, so that the luminosity of the phosphorus may be noted. For the separation of an alkaloid, the following is the process of Stas-Otto.
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