Download CK-12 Biology I - Honors by CK-12 Foundation PDF

Download CK-12 Biology I - Honors by CK-12 Foundation PDF

By CK-12 Foundation

CK-12 Biology I is a textbook for top institution scholars masking cellphone biology, genetics, evolution, ecology, and body structure.

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The irritation of the cerebral ganglia appears to cause certain muscles to contract in an inevitable manner, independently of the will 24 HABITS OP WOEMS. CHAP. I. or consciousness of the animal, as if it were an automaton. But the different effect which a light produced on different occasions, and especially the fact that a worm when in any way employed and in the intervals of such employment, whatever set of muscles and ganglia may then have been brought into play, is often regardless of light, are opposed to the view of the sudden withdrawal being a simple reflex action.

When leaves of the cabbage, horseradish (a favourite food) and of the onion were given together, the latter were always and manifestly preferred. Leaves of the cabbage, lime-tree, Ampelopis, parsnip (Pastinaca), and celery (Apium) were likewise given together; and those of the celery were first eaten. But when leaves of cabbage, turnip, beet, celery, CHAP. I. THEIK SENSES. 33 wild cherry a*nd carrots were given together, the two latter kinds, especially those of the carrot, were preferred to all the others, including those of celery.

These concretions when broken are seen to be more or less crystalline in structure. How they escape from the gland is a marvel; but that they do escape is certain, for they are often found in the gizzard, intestines, and in the castings of worms, both with those kept in confinement and those in a state of nature. Claparede says very little about the structure of the two anterior glands, and he supposes that the calcareous matter of which the concretions are formed is derived from the four posterior glands.

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