Ocean Gardens : the History of the Marine Aquarium And the Best Methods Now Adopted for Its Establishment And Preservation
The book Ocean Gardens : the History of the Marine Aquarium And the Best Methods Now Adopted for Its Establishment And Preservation was written by author Humphreys, Henry Noel, 1810-1879 Here you can read free online of Ocean Gardens : the History of the Marine Aquarium And the Best Methods Now Adopted for Its Establishment And Preservation book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Ocean Gardens : the History of the Marine Aquarium And the Best Methods Now Adopted for Its Establishment And Preservation a good or bad book?
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The shells of the clothed Molluscs are senseless, 70 OR, GLIMPSES BENEATH THE WATEES. being permeated by no vessels, and. are formed by the animal itself from a secretion with which its outer integuments are invested, and which may be described as lime in a state of solution. The thickened edge of the mantle, by means of which the form is given to the shell, and the general manipulation effected, is furnished, as may be seen with the aid of a moderate lens, with a minute and highly sensitive fr...inge, the cdia of which are of various colours, corresponding in tone and position to the tints which decorate the ex- terior of the shell. The coloured cUia or fringes have doubtless a dyeing power, which colours the calca- reous solution at the time it is added to the sheU. by their plastic instinct. The solution becomes a hard testaceous substance so soon as it leaves the body of the animal, and is duly deposited, in arcliitectural layers, upon the beautiful structure of the shell, by the "trowel" and "brushes" of the edge of the mantle.
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