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Книга по требованию: The Dogfish (Acanthias)

Товар № 11383113

An Elasmobranch (Classic Reprint)

Вес: 0.09 кг.
Год издания: 2015
Страниц: 44 Переплет: мягкая обложка
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Excerpt from The Dogfish (Acanthias): An Elasmobranch

These directions for dissection are intended eventually to include representatives of all the major groups of vertebrates. Each is complete in itself and is issued separately so that laboratories may select those forms best adapted for their courses. The directions have been tested by several years' use and are thought to have a distinct pedagogic value in that they do not so much tell the student what he will find, but instead ask him what he does find. He thus obtains his information from the specimen, not from the printed page. For similar reasons illustrations have been omitted; students sometimes find it easier to copy the published figure than to work out the points for themselves.

No attempt has been made to follow out every system of organs completely, but each has been traced far enough to give a good knowledge of the more important structures to use as a basis for comparisons. The student by following the directions may obtain a knowledge of the general anatomy of the animal studied, but this knowledge of itself has little value. More important is the benefit to be gained by comparing the different forms dissected, tracing as far as possible their resemblances and differences. Hence in his dissection the student should continually recall the conditions existing in all other animals as he is tracing out each part.

More than this: he should read the general statements given in manuals of vertebrate structure as he takes up each organ or system of organs, thus correlating his discoveries and making them a part of one general whole. It would be well to go farther and read the accounts of the development of the organs in question in some of the text-books of vertebrate embryology. It is only in this way that an explanation of many peculiarities of structure may be obtained.

Unless explicitly used otherwise the terms right and left in the following directions apply to the right and left of the animal being dissected, not of the student.

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