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Updated: September 20, 2025
This statement, with all due deference to the opinion of our illustrious critic, is by no means correct. Yeast has no action on malate of lime, or on other calcareous salts formed by vegetable acids. Liebig had previously, much to his own satisfaction, brought forward urea as being capable of transformation into carbonate of ammonia during alcoholic fermentation in contact with yeast.
Protestor Liebig, in his Modern Agriculture, says: "There is not to be found in chemistry a more wonderful phenomenon, one which more confounds all human wisdom, than is presented by the soil of a garden or field.
Then the stranger suddenly disappeared, and Liebig, with the painful feeling of being considered a very uncivil fellow, was obliged to let the Thursday pass without accepting the invitation so important to him. But on Saturday some one knocked at the door of his modest little room and introduced himself as Alexander von Humboldt's valet.
In short, Liebig is not justified in saying that the solution of pure sugar, caused to ferment by means of yeast, contains none of the elements needed for the growth of yeast, neither nitrogen, sulphur nor phosphorus, and that, consequently, it should not be possible, by our theory, for the sugar to ferment.
'We will converse on this subject with you more in detail some day, dear Yevgeny Vassilyitch; we will hear your views, and express our own. For my part, I am heartily glad you are studying the natural sciences. I have heard that Liebig has made some wonderful discoveries in the amelioration of soils. You can be of assistance to me in my agricultural labours; you can give me some useful advice.
Liebig, therefore, in confuting some modern notions as to the nature of contagion by miasma, is leading their reasonings back to that assumption in the Brawn of physiological science by which the discoverer of gas exalted into the principle of life the substance to which he first gave the name, now so familiarly known.
It will be remarked that the coincidence of their changes in this disease with enlargement of the spleen suggests the idea of a similarity of function in these two organs. The theories of the production of animal heat, from the times of Black, Lavoisier, and Crawford to those of Liebig, are familiar to all who have paid any attention to physiological studies.
This is tantamount to saying that MORE MATTER weighs more than LESS MATTER; and, since weight is the essence of materiality, we may logically conclude that, weight being universally identical with itself, there is also an identity in matter; that the differences of simple bodies are due solely, either to different methods of atomic association, or to different degrees of molecular condensation, and that, in reality, atoms are transmutable: which M. Liebig does not admit.
Liebig, the celebrated writer on animal chemistry, having found that both sugar and alcohol were heat-producing articles of food, framed a theory that alcohol is burnt in the lungs, giving off carbonic acid and water, and thus serving to warm the body.
The first years we saw most frequently the song-writer Silcher, from Tubingen, Justus von Liebig, the Munich zoologist von Siebold, the Belgian artist Louis Gallait, the author Moritz Hartmann, Gervinus, and, lastly, the wife of the Stuttgart publisher Eduard Hallberger, and the never-to-be-forgotten Frau Puricelli and her daughter Jenny.
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