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The skin may have important uses with which we are not yet acquainted. Death ensues when the heat of the body has been reduced to about 70 degrees F., and suppression of the action of the skin always produces a lowering of the temperature. Warm-blooded animals usually die when more than half of the general surface has been varnished.
In order to reassert, in an inverted form, the whole of what was affirmed in the proposition, All quadrupeds are warm-blooded, we must convert it by contraposition, thus, Nothing which is not warm-blooded is a quadruped.
Warm-blooded animals which have fur or hair, bring forth their young alive, and nurse them. House People are Mammals. CLASS II. Birds. Warm-blooded animals which have feathers and lay eggs. CLASS III. Reptiles. Cold-blooded animals which have scaly skins, like lizards, snakes, and turtles. CLASS IV. Batrachians. Cold-blooded animals which have naked skins, like frogs, toads, and newts.
The bird is warm-blooded, intensely active, and very much more complex both in bodily structure and in mind development. Here the reproductive activity is yet more economically conducted, and instead of thirty or more eggs, the bird produces often not more than six in a season, and even a smaller number if it is single-brooded, some eagles, for instance, rearing only two young in a season.
She sat up as he released his knee, her hoarse voice squeezed from between her writhing lips. "Are you satisfied now, you mechanical beast! Do you still think I have it on me?" He grinned, twisting the corners of his mouth. "You don't. Don't you know a wife shouldn't keep secrets from her husband? A warm-blooded, affectionate husband, to boot."
The fall in temperature in some is wonderful; as an example, the high body temperature of warm-blooded animals may be said to oscillate between 36 deg. and 43 deg. Cent. Experiments made with the zizel show that during hibernation this animal's temperature is only 2 deg.
Great good luck came to us when the first pair of eyes were invented, probably by the trilobite back in Silurian times; when the first ear appeared, probably in Carboniferous times; when the first pair of lungs grew out of a fish's air-bladder, probably in Triassic times; when the first four-chambered heart was developed and double circulation established, probably with the first warm-blooded animal in Mesozoic times.
It is but lately, no doubt, with the turning perhaps of her seventeenth year, at some fuller opening into womanhood, that her romantic dream has taken such possession of her, and his warm-blooded urgent love become something to withdraw from, without clearly formulated reason, by an instinct. She tries now to silence him, to put him off with the excuse that she must hurry to her father.
Oh, but there is something touching about her, this woman getting on in years; plain to see that a glance from one of these warm-blooded menfolk came all unexpectedly to her; she was grateful for it, and returned it; she was a woman like other women, and it thrilled her to feel so. An honest woman she had been, but like enough 'twas for lack of opportunity. Getting on in years.... Gustaf came up.
If he had a spark of intelligence he'd lay one egg a year, like a hen, and thus live for a million years. But does he? Not on your Sarony! He's a spendthrift, and turns his eggs loose a hatful at a time. He's worse than a shotgun. And then, too, he's as clannish as a Harvard graduate, and don't associate with nobody out of his own set. No, sir! Give me a warm-blooded animal that suckles its young.
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