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The disease is "contagious," because a healthy fly coming in contact with a diseased one, from which the spore-bearing filaments protrude, is pretty sure to carry off a spore or two. It is "infectious" because the spores become scattered about all sorts of matter in the neighbourhood of the slain flies.
One such adrift in the body is like a ferret in a rabbit warren; no other cell can face it for an instant. In fact, it is a genuine "animal spore," or seed-cell, capable of taking root and reproducing its kind in any favorable soil; and, unfortunately, almost every inch of a cancer patient's body seems to be such. It is merely a question of where the spore-cells happen to drift and lodge.
A spore is a minute mass of protoplasm surrounded by a dense, tough membrane, developed in the interior of the parent cell. Spores are remarkable for their tenacity of life, and for the resistance they offer to the action of heat and chemical germicides. Bacteria are most conveniently classified according to their shape.
The natives pound it between two stones, and make it into cakes like flour. The spores vegetate in water, and root in soil at the bottom, where the plant grows to maturity. After the water dries up, the plants die, and leave the spore cases on, in many instances quite covering the surface of the dried mud. It is then that they are gathered for food.
The English people grew into a powerful nation, and Nature still waited for a full return of the capital she had invested in the ancient club-mosses. The eighteenth century arrived, and with it James Watt. The brain of that man was the spore out of which was developed the steam-engine, and all the prodigious trees and branches of modern industry which have grown out of this.
The process of spore formation just described, it will be seen, is entirely non-sexual, being simply a vegetative process, analogous to the budding of higher plants, and the fission of some of the lower plants and animals.
Small, now, they would seem to us; but to the infinite mind all things small and great are alike; the spore of rust in the ear is very slight, but a famine in the corn will shake the world. Pinckney's life the world called lazy; his leisure was not fruitful, and his sixty years of life were but a gentleman's.
Herbert Spencer will descend from his stilted theory of "molecular machinery worked by molecular force," and tell us what it all means; and, at the same time, turn us out a single plastide particle, or fungus spore, by any generating process referable to "the machinery" in question, we will as devoutly worship Matter and Motion as ever ancient Egyptian did the god Osiris.
These groups of yellow spores burst forth in irregular powdery patches, scattered over the under sides of the leaves in July and August: toward the end of the summer a slightly different form of spore, but similarly arranged, springs from the same mycelium on the same patches.
In other words, the fungus growing in the cortex of the pine, and that parasitic on the leaves of the groundsel and its allies, are one and the same: it spends part of its life on the tree and the other part on the herb. A spore of Peridermium Pini germinating.
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