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The helpers may also be regarded as direct and indirect: in the case of a carnivorous animal, for example, a particular herbaceous plant may, in multiplying, be an indirect helper, by enabling the herbivora on which the carnivore preys to get more food, and thus to nourish the carnivore more abundantly; the direct helper may be best illustrated by reference to some parasitic creature, such as the tape-worm.
The ovum of a tape-worm, getting into its natural habitat, the intestine, unfolds into the well-known form of its parent; but if carried, as it frequently is, into other parts of the system, it becomes a sac-like creature, called by naturalists the Echinococcus a creature so extremely different from the tape-worm in aspect and structure, that only after careful investigations has it been proved to have the same origin.
No doubt the germ of the special form of tape-worm which troubles oysters, irritates to pearl-making, and passes through other transformations in other hosts, and completes its cycle in the body of a shark, would be too minute for inexpert detection.
Reynold: On an estate where a great quantity of rabbits are annually destroyed in the month of November, we have observed that several dogs that were previously in good health and condition soon became weak, listless, and excessively emaciated, frequently passing large portions of the tape-worm.
In like manner, in osteology, he assumed that one vertebra of the spine might be considered the unit of the skeleton; the head was only the uppermost vertebra transformed. "The plant goes from knot to knot, closing, at last, with the flower and the seed. So the tape-worm, the caterpillar, goes from knot to knot, and closes with the head.
The appearance of the ascaris in the dog's stools is, of course, the diagnostic symptom. But areca-nut does better for tape-worm, so we cannot do better than trust to pure santonin. The dose is from 1 grain for a Toy up to 6 grains for a Mastiff. Mix it with a little butter, and stick it well back in the roof of the dog's mouth.
The living filament is a part of the father, and has therefore certain propensities, or appetencies, which belong to him; which may have been gradually acquired during a million of generations, even from the infancy of the habitable earth; and which now possesses such properties, as would render, by the apposition of nutritious particles, the new fetus exactly similar to the father; as occurs in the buds and bulbs of vegetables, and in the polypus, and tænia or tape-worm.
Examine for a moment the two cases from Epidaurus, which are quite typical of the series. We observe that the first is described simply as a case of 'tape-worm' without any justification for the diagnosis. It is not unfrequent nowadays for thin and anxious patients to state, similarly without justification, that they suffer from this condition.
Another worm about the same size was found in the left bronchia, and a still smaller one among the mucus of the trachea: there were also four others in the nose. Some years ago I found some worms of the filacia species in the right ventricle of the heart of a dog, which had produced sudden death by interrupting the action of the valves. The following is a curious case of tape-worm, by Mr.
The tape-worm exists in the human intestines, so that the fewer there are of men the fewer there will be of tape-worms, other things being alike. It is a humiliating reflection, perhaps, that we may be classed as direct helpers to the tape-worm, but the fact is so: we can all see that if there were no men there would be no tape-worms.
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