An Introduction to Entomology Or Elements of the Natural History of Insects
An Introduction to Entomology Or Elements of the Natural History of Insects
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In our eReader you can find the full English version of the book. Read An Introduction to Entomology Or Elements of the Natural History of Insects Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book An Introduction to Entomology Or Elements of the Natural History of Insects
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Or, if they are wholly closed, how is the water, which is necessary to their respiration and life, to be introduced ? These sagacious creatures know how to compass both these ends at once. They fix a grate or portcullis to each extremity of their fortress, which at the same time keeps out intruders and admits the water. These grates they weave with silk spun from their anus into strong threads, which cross each other, and are not soluble in water. One of them, de- scribed by De Geer, is very re...markable. It consists of a small, thickish, circular lamina of brown silk, becoming as hard as gum, which exactly fits the aperture of the case, and is fixed a little within the margin. It is pierced all over with holes disposed in concentric circles, and separated by ridges which go from the centre to the circumference, but often not quite so re- gularly as the radii of a circle or the spokes of a wheel. These radii are traversed again by other ridges, which follow the direction of the circles of holes ; so that the two kinds of ridges crossing each other form compart- ments, in the centre of each of which is a hole.
What to read after An Introduction to Entomology Or Elements of the Natural History of Insects?
You can find similar books in the "Read Also" column, or choose other free books by Kirby William to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Or, if they are wholly closed, how is the water, which is necessary to their respiration and life, to be introduced ? These sagacious creatures know how to compass both these ends at once. They fix a grate or portcullis to each extremity of their fortress, which at the same time keeps out intruders and admits the water. These grates they weave with silk spun from their anus into strong threads, which cross each other, and are not soluble in water. One of them, de- scribed by De Geer, is very re...markable. It consists of a small, thickish, circular lamina of brown silk, becoming as hard as gum, which exactly fits the aperture of the case, and is fixed a little within the margin. It is pierced all over with holes disposed in concentric circles, and separated by ridges which go from the centre to the circumference, but often not quite so re- gularly as the radii of a circle or the spokes of a wheel. These radii are traversed again by other ridges, which follow the direction of the circles of holes ; so that the two kinds of ridges crossing each other form compart- ments, in the centre of each of which is a hole.
What to read after An Introduction to Entomology Or Elements of the Natural History of Insects?
You can find similar books in the "Read Also" column, or choose other free books by Kirby William to read onlineMoreLess
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