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Soon they block up the gland-tube, then begin to push out in the form of finger-or root-like columns of cells into the surrounding tissues. These columns appear to have the curious power of either turning their natural digestive ferments against the surrounding tissues, or secreting new ferments for the purpose, closely resembling pepsin, and thus literally eating their way into them.
Each tube is lined with columnar epithelial cells, and there is a minute central passage with the "neck" at N. Here and there are seen other special cells called parietal cells, P, which are supposed to produce the acid of the gastric juice. Pepsin the important constituent of the gastric juice, has the power, in the presence of an acid, of dissolving the proteid food-stuffs.
They do not eat: they drink their fill; by means of a pepsin which they disgorge, they first turn their foodstuffs into soup; they practice a strange and exceptional art of feeding, wherein those dangerous carving implements, the scalpels with their dissecting room perils, are superfluous.
To this I would reply that it does not matter in the least, to us, as analysts, what are the conditions which obtain in the stomach; since there is no absolute test for pepsin, we can only compare one sample against another, and that which dissolves the most albumen in the shortest time is taken to be the best.
The singular circumstance observed by Meyer, that the Torula of yeast, though an indubitable plant, still flourishes most vigorously when supplied with the complex nitrogenous substance, pepsin; the probability that the Peronospora is nourished directly by the protoplasm of the potato-plant; and the wonderful facts which have recently been brought to light respecting insectivorous plants, all favour this view; and tend to the conclusion that the difference between animal and plant is one of degree rather than of kind, and that the problem whether, in a given case, an organism is an animal or a plant, may be essentially insoluble.
Half fill with dilute hydrochloric acid three large test tubes, labelled A, B, C. Add to each a few grains of pepsin. Boil B, and make C faintly alkaline with sodic carbonate. The alkalinity may be noted by adding previously some neutral litmus solution.
They grow on trees, quite like palms, from ten to thirty feet high, the trunk scaly like an alligator's hide, and the leaves pointed. The fruit hangs in a cluster at the crown of the tree, green and yellow, resembling badly shaped melons. The taste is musky sweet and not always agreeable to tyros. The seeds are black and full of pepsin.
In a recently patented process for the production of non-alcoholic beer it is admitted that salt, gum arabic, quassia, a pepsin compound and meta-bisulphite of potassium, or another suitable drug, are some of the materials used in brewing the non-alcoholic product.
In the stomach the food is acted on and dissolved by the gastric juice or pepsin, which is poured out by an almost infinity of minute tubes, or follicles as they are termed.
Does the coprinus digest itself by virtue of a pepsin similar to the maggots'? One would like to discover the oxidizable substance that gives the luminous mushroom its soft, white light, which is like the beams of the full moon.
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