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It was at least two feet in length, a curved bone, with a membranous veil beneath it. "A monstrous bat!" I suggested. "Nothing of the sort," said the Professor, severely. "Living, as I do, in an educated and scientific atmosphere, I could not have conceived that the first principles of zoology were so little known.
By means of the folds or membranous valves the mouths of the bronchial tubes may be opened widely or almost closed, and in this way, to quote from Mr. Thompson, "the bird is enabled to measure in the nicest manner the amount of air thrown from the lungs into the trachea."
Bats live in roofs, and hang there wrapped up in their membranous wings till the evening calls them forth. They are residents in the full sense, remaining all the year round, though principally seen in the warmer months; but they are there in the colder, hidden away, and if the temperature rises, will venture out and hawk to and fro in the midst of the winter.
Slowly and methodically, from top to base, the new-born grubs nibble the wallets whence they have just emerged. By to-morrow, nothing is left of these but a pattern of round dots, the bases of the vanished sacks. As his first mouthfuls, therefore, the Cabbage-caterpillar eats the membranous wrapper of his egg.
The effect of the alcohol upon the liver is upon the minute membranous or capsular structure of the organ, upon which, it acts to prevent the proper dialysis and free secretion. The organ, at first, becomes large from the distention of its vessels, the surcharge of fluid matter and the thickening of tissue.
This is attached at its inner margin to the membranous capsule, and at its outer margin to the sides of the eyeball, and entirely surrounds the lens. It is drawn perfectly tight so that the sides of the eyeball exert a continuous tension, or pull, on the membranous capsule, which, in its turn, exerts pressure on the sides of the lens, tending to flatten it.
The stem, of a brownish colour and three inches long, has circular leaves with lobes, and indented at the edges. The colour of these leaves is a pale green, and they are membranous and streaked like those of the adiantums and Gingko biloba. Their surface is covered with stiff whitish hairs; before their opening they are concave, and enveloped one in the other.
He then distinctly perceived caverns frequented by hippopotami, green mountains bordered by golden lace-work, sheep with horns of ivory, a white species of deer and inhabitants with membranous wings, like bats. This brochure, the work of an American named Locke, had a great sale.
Indeed, there is evidence in support of the view that one species has a membranous eyelid similar to, but slighter than, that of a bird. It is not to be doubted that another reptile the green turtle is thus endowed, and that the "winking membrane" is found in many animals at the inner angle or beneath the lower lid of the eye. This membrane is represented in animals by a rudiment only.
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