W. Hagelberg's Manual of Zoology, Embracing Faithful Illustrations of the Animal World in Its Most Prominent Types: Part VI; Mollusca, 4 Plates, ... Protozoa, 6 Plates, Containing 72

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9781333475314: W. Hagelberg's Manual of Zoology, Embracing Faithful Illustrations of the Animal World in Its Most Prominent Types: Part VI; Mollusca, 4 Plates, ... Protozoa, 6 Plates, Containing 72

Excerpt from W. Hagelberg's Manual of Zoology, Embracing Faithful Illustrations of the Animal World in Its Most Prominent Types: Part Vi; Mollusca, 4 Plates, Containing 48 Illustrations; Part VII; Vermes, Echinodermata, Coelenterata, Protozoa, 6 Plates, Containing 72 Illustrations
The propagation of the Mollusca is effected by means of eggs, a marvellous number of which are generated by some of the tribe; the oyster, for instance, will produce upwards of a million young in the course of a twelvemonth. In some cases the young emerge from the egg in a perfectly formed state, in others they have to pass through a larva stage. As regards development of size, the snails soon attain their maximum, while the cephalopods and mussels never seem to leave off growing. The duration of life in most species of the Mollusca is very prolonged, it having been ascertained that mussels, which had been marked and kept in some particular waters, have attained an age of from 70 to 80 years.
One of the most prominent peculiarities observable in many of the Mollusca is the faculty they possess of being able to construct a shell to live in. As mentioned above, the matter required for this purpose is secreted by the mantle, its chief ingredient being lime. The shell of the various descriptions of snails however, which is always more or less spiral in form, is built up on a core consisting of organic matter, around which the particles of lime are disposed, often exhibiting a beautifully variegated coloring. Both the shells of the true mussels consist of two layers, the outer one of which consists of calcareous matter, while the inner one, which lies next the body, exhibits a coating of mother of pearl. The two shells are connected by an elastic ligament, and can be opened or closed by the animal at pleasure by means of a pair of muscles.
The body of those Mollusks, which are not furnished with any shell, is covered with a firm skin, more or less granulated and slimy.
Water is an indispensable necessary of life with all the Mollusca, even those which live on dry land requiring a large amount of moisture for their existence, a prolonged drought being fatal to them. Rivers and inland waters are tenanted by a great variety of the snail and mussel tribe, the greatest abundance being however found in the Ocean, which contains Mollusks in its deepest waters, and there these creatures pass their lives, almost the sole occupation of which consists in feeding, seldom stirring, and then only slowly, from one spot.
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This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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W Hagelberg
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ISBN 10: 1333475314 ISBN 13: 9781333475314
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Book Description Forgotten Books, United States, 2016. Paperback. Book Condition: New. Language: English . Brand New Book ***** Print on Demand *****. Excerpt from W. Hagelberg s Manual of Zoology, Embracing Faithful Illustrations of the Animal World in Its Most Prominent Types: Part Vi; Mollusca, 4 Plates, Containing 48 Illustrations; Part VII; Vermes, Echinodermata, Coelenterata, Protozoa, 6 Plates, Containing 72 Illustrations The propagation of the Mollusca is effected by means of eggs, a marvellous number of which are generated by some of the tribe; the oyster, for instance, will produce upwards of a million young in the course of a twelvemonth. In some cases the young emerge from the egg in a perfectly formed state, in others they have to pass through a larva stage. As regards development of size, the snails soon attain their maximum, while the cephalopods and mussels never seem to leave off growing. The duration of life in most species of the Mollusca is very prolonged, it having been ascertained that mussels, which had been marked and kept in some particular waters, have attained an age of from 70 to 80 years. One of the most prominent peculiarities observable in many of the Mollusca is the faculty they possess of being able to construct a shell to live in. As mentioned above, the matter required for this purpose is secreted by the mantle, its chief ingredient being lime. The shell of the various descriptions of snails however, which is always more or less spiral in form, is built up on a core consisting of organic matter, around which the particles of lime are disposed, often exhibiting a beautifully variegated coloring. Both the shells of the true mussels consist of two layers, the outer one of which consists of calcareous matter, while the inner one, which lies next the body, exhibits a coating of mother of pearl. The two shells are connected by an elastic ligament, and can be opened or closed by the animal at pleasure by means of a pair of muscles. The body of those Mollusks, which are not furnished with any shell, is covered with a firm skin, more or less granulated and slimy. Water is an indispensable necessary of life with all the Mollusca, even those which live on dry land requiring a large amount of moisture for their existence, a prolonged drought being fatal to them. Rivers and inland waters are tenanted by a great variety of the snail and mussel tribe, the greatest abundance being however found in the Ocean, which contains Mollusks in its deepest waters, and there these creatures pass their lives, almost the sole occupation of which consists in feeding, seldom stirring, and then only slowly, from one spot. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works. Bookseller Inventory # APC9781333475314

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W Hagelberg
Published by Forgotten Books, United States (2016)
ISBN 10: 1333475314 ISBN 13: 9781333475314
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Book Description Forgotten Books, United States, 2016. Paperback. Book Condition: New. Language: English . Brand New Book ***** Print on Demand *****.Excerpt from W. Hagelberg s Manual of Zoology, Embracing Faithful Illustrations of the Animal World in Its Most Prominent Types: Part Vi; Mollusca, 4 Plates, Containing 48 Illustrations; Part VII; Vermes, Echinodermata, Coelenterata, Protozoa, 6 Plates, Containing 72 Illustrations The propagation of the Mollusca is effected by means of eggs, a marvellous number of which are generated by some of the tribe; the oyster, for instance, will produce upwards of a million young in the course of a twelvemonth. In some cases the young emerge from the egg in a perfectly formed state, in others they have to pass through a larva stage. As regards development of size, the snails soon attain their maximum, while the cephalopods and mussels never seem to leave off growing. The duration of life in most species of the Mollusca is very prolonged, it having been ascertained that mussels, which had been marked and kept in some particular waters, have attained an age of from 70 to 80 years. One of the most prominent peculiarities observable in many of the Mollusca is the faculty they possess of being able to construct a shell to live in. As mentioned above, the matter required for this purpose is secreted by the mantle, its chief ingredient being lime. The shell of the various descriptions of snails however, which is always more or less spiral in form, is built up on a core consisting of organic matter, around which the particles of lime are disposed, often exhibiting a beautifully variegated coloring. Both the shells of the true mussels consist of two layers, the outer one of which consists of calcareous matter, while the inner one, which lies next the body, exhibits a coating of mother of pearl. The two shells are connected by an elastic ligament, and can be opened or closed by the animal at pleasure by means of a pair of muscles. The body of those Mollusks, which are not furnished with any shell, is covered with a firm skin, more or less granulated and slimy. Water is an indispensable necessary of life with all the Mollusca, even those which live on dry land requiring a large amount of moisture for their existence, a prolonged drought being fatal to them. Rivers and inland waters are tenanted by a great variety of the snail and mussel tribe, the greatest abundance being however found in the Ocean, which contains Mollusks in its deepest waters, and there these creatures pass their lives, almost the sole occupation of which consists in feeding, seldom stirring, and then only slowly, from one spot. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works. Bookseller Inventory # APC9781333475314

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Book Description Forgotten Books, United States, 2016. Paperback. Book Condition: New. Language: English . This book usually ship within 10-15 business days and we will endeavor to dispatch orders quicker than this where possible. Brand New Book. Excerpt from W. Hagelberg s Manual of Zoology, Embracing Faithful Illustrations of the Animal World in Its Most Prominent Types: Part Vi; Mollusca, 4 Plates, Containing 48 Illustrations; Part VII; Vermes, Echinodermata, Coelenterata, Protozoa, 6 Plates, Containing 72 Illustrations The propagation of the Mollusca is effected by means of eggs, a marvellous number of which are generated by some of the tribe; the oyster, for instance, will produce upwards of a million young in the course of a twelvemonth. In some cases the young emerge from the egg in a perfectly formed state, in others they have to pass through a larva stage. As regards development of size, the snails soon attain their maximum, while the cephalopods and mussels never seem to leave off growing. The duration of life in most species of the Mollusca is very prolonged, it having been ascertained that mussels, which had been marked and kept in some particular waters, have attained an age of from 70 to 80 years. One of the most prominent peculiarities observable in many of the Mollusca is the faculty they possess of being able to construct a shell to live in. As mentioned above, the matter required for this purpose is secreted by the mantle, its chief ingredient being lime. The shell of the various descriptions of snails however, which is always more or less spiral in form, is built up on a core consisting of organic matter, around which the particles of lime are disposed, often exhibiting a beautifully variegated coloring. Both the shells of the true mussels consist of two layers, the outer one of which consists of calcareous matter, while the inner one, which lies next the body, exhibits a coating of mother of pearl. The two shells are connected by an elastic ligament, and can be opened or closed by the animal at pleasure by means of a pair of muscles. The body of those Mollusks, which are not furnished with any shell, is covered with a firm skin, more or less granulated and slimy. Water is an indispensable necessary of life with all the Mollusca, even those which live on dry land requiring a large amount of moisture for their existence, a prolonged drought being fatal to them. Rivers and inland waters are tenanted by a great variety of the snail and mussel tribe, the greatest abundance being however found in the Ocean, which contains Mollusks in its deepest waters, and there these creatures pass their lives, almost the sole occupation of which consists in feeding, seldom stirring, and then only slowly, from one spot. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works. Bookseller Inventory # LIE9781333475314

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