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Updated: June 25, 2025
While these people were repairing the fatigues of their journey, a door opened very softly at the end of the room. But Schwann heard it. This door had access to the stairs which led to the upper floor. He instantly hastened toward the person, who stood half concealed. This man was about forty, small, and wearing a brown cloth coat, braided and trimmed with Astrachan.
The force of Liebig's authority and the brilliancy of his expositions led to the wide acceptance of his views and the temporary obscurity of the relation of microscopic organisms to fermentative and putrefactive processes. The objections to Liebig's views were hardly noticed, and the force of the experiments of Schwann was silently ignored.
A century and a half elapsed, and the investigation of yeast was recommenced almost simultaneously by Cagniard de la Tour in France, and by Schwann and Kützing in Germany. The French observer was the first to publish his results; and the subject received at his hands and at those of his colleague, the botanist Turpin, full and satisfactory investigation.
The earlier idea had, in effect, declared the shell the most important part of the egg; this developed view assigned to the yolk its true position. In one other important regard the theory of Schleiden and Schwann now became modified. This referred to the origin of the cell.
In other words, Schwann conceives that every cell of the living body exerts an influence on the matter which surrounds and permeates it, analogous to that which a Torula exerts on the saccharine solution by which it is bathed.
I would state it more broadly as the agency of the cell in all living processes. It seems at present necessary to abandon the original idea of Schwann, that we can observe the building up of a cell from the simple granules of a blastema, or formative fluid.
Though, as formulated by Schwann and Schleiden, the cell-doctrine has undergone qualifications of statement; yet the qualifications have not been such as to militate against the general proposition that organisms visible to the naked eye, are severally compounded of invisible organisms using that word in its most comprehensive sense.
"Ah! you have come, children, have you?" cried Gudel. "And I am thankful, for hunger gnaws my vitals." "And mine, too," Bobichel replied, throwing a somersault as he spoke; which he ended with a sudden leap on the shoulders of the good Schwann, who stood the shock with wonderful philosophy. But at the third shout he decided to go outside.
Yet at the same time it was in effect the banishment of the cell that Schwann had defined. The word cell was retained, it is true, but it no longer signified a minute cavity. It now implied, as Schultze defined it, "a small mass of protoplasm endowed with the attributes of life."
And by cell Schwann meant, as did Schleiden also, what the word ordinarily implies a cavity walled in on all sides. He conceived that the ultimate constituents of all tissues were really such minute cavities, the most important part of which was the cell wall, with its associated nucleus.
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