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We should be extremely cautious in concluding that an organ could not have been formed by transitional gradations of some kind. Numerous cases could be given amongst the lower animals of the same organ performing at the same time wholly distinct functions; thus the alimentary canal respires, digests, and excretes in the larva of the dragon-fly and in the fish Cobites.
We're like that little shell the Lingula, that is found in the oldest rocks and lives to-day: it fitted its easy conditions, and it has never modified since. Why should it? It excretes all its disturbing forces. Our younger sons go away and found colonial empires. Our surplus cottage children emigrate to Australia and Canada or migrate into the towns. It doesn't alter this...." Section 12 Mr.
It has been ascertained, beyond a doubt, that the sponge is an animal that sucks in its food and excretes its superfluities; that certain of its pores imbibe, while others exude; and that according to the relative positions of the two distinct sets of pores, is the shape of the sponge determined.
We should be extremely cautious in concluding that an organ could not have been formed by transitional gradations of some kind. Numerous cases could be given among the lower animals of the same organ performing at the same time wholly distinct functions; thus in the larva of the dragon-fly and in the fish Cobites the alimentary canal respires, digests, and excretes.
But, though the notion that the Torula is a creature which eats sugar and excretes carbonic acid and alcohol, which is not unjustly ridiculed in the most surprising paper that ever made its appearance in a grave scientific journal , may be untenable, the fact that the Torulae are alive, and that yeast does not excite fermentation unless it contains living Torulae, stands fast.
It is safer to say that it is irritable, that is, it reacts to stimuli too feeble to be regarded as the cause of its reaction. It engulfs microscopic plants, and digests them in the internal protoplasm by the aid of an acid secretion. It breathes oxygen, and excretes carbonic acid and urea, through its whole body surface.
It protects the delicate structures which it covers, assists in the regulation of the temperature of the body, and excretes waste products. The excretory function of the skin is always active, but we are unconscious of this activity except on warm days and at times when we perspire freely. In the coldest weather, however, the body throws off what physiologists call the "insensible perspiration."
We should be extremely cautious in concluding that an organ could not have been formed by transitional gradations of some kind. Numerous cases could be given amongst the lower animals of the same organ performing at the same time wholly distinct functions; thus the alimentary canal respires, digests, and excretes in the larva of the dragon-fly and in the fish Cobites.
As for the excrements of these two puppies, the gold puppy excretes gold and the silver puppy excretes silver. This being so, you will be greatly enriched if you sell these excrements to the officials. Understand this!" Then the man, with respectful salutations, went away, carrying with him the two puppies, and came to his own house. Then he gave the puppies a little food at a time.
But in a small animal the circulatory system is often unnecessary and fails. Breathing and excretion take place through the whole surface of the body. The body of the frog is devoid of scales, so that the blood is separated from the surrounding water only by a thin membrane, and it breathes and excretes to a certain extent in the same way. But another factor has to be considered.
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