Elements of Zoology: For the Use of Schools and Science Classes

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Black, 1873 - 634페이지
 

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19 페이지 - ... suggest that there is no difference in faculty between the lowest plant and the highest, or between plants and animals. But the difference between the powers of the lowest plant, or animal, and those of the highest is one of degree, not of kind, and depends, as Milne-Edwards long ago so well pointed out, upon the extent to which the principle of the division of labour is carried out in the living economy.
18 페이지 - It is by no means my intention to suggest that there is no difference in faculty between the lowest plant and the highest, or between plants and animals. But the difference between the powers of the lowest plant, or animal, and those of the highest, is one of degree, not of kind...
19 페이지 - In the lowest organism all parts are competent to perform all functions, and one and the same portion of protoplasm may successively take on the function of feeding, moving, or reproducing apparatus. In the highest, on the contrary, a great number of parts combine to perform each function, each part doing its allotted share of the work with great accuracy and efficiency, but being useless for any other purpose.
25 페이지 - By the classification of any series of objects is meant the actual or ideal arrangement together of those which are like and the separation of those which are unlike ; the purpose of this arrangement being, primarily, to facilitate the operations of the mind in clearly conceiving and retaining in the memory the characters of the objects in question...
422 페이지 - In the gavials, (genus gavialis,) the teeth are nearly equal in size, and similar in form, in both jaws, and the first, as well as the fourth tooth in the lower jaw, passes into a groove in the margin of the upper jaw when the mouth is closed.
47 페이지 - Now that we know the whole cycle of the life of the sponges, and the characters which may be demonstrated to be common to the whole of this important and remarkable class, I do not think any one who is acquainted with the organization or the functions of plants, will be inclined to admit that the Spongida have the slightest real affinity with any division of the vegetable kingdom.
424 페이지 - that the enormous eye of which they formed the front, was an optical instrument of varied and prodigious power, enabling the Ichthyosaurus to descry its prey at great or little distances, in the obscurity of night, and in the depths of the sea.
422 페이지 - In the crocodiles, (genus crocodilus,) the first tooth in the lower jaw perforates the palatal process of the premaxillary bone when the mouth is closed ; the fourth tooth in the lower jaw is received into a notch excavated in the side of the alveolar border of the upper jaw, and is visible externally when the mouth is closed.
570 페이지 - ... and the proportions of the arms, while the gorilla resembles him more in the proportions of the leg to the body, of the foot to the hand, in the size of the heel, the curvature of the spine, the form of the pelvis, and the absolute capacity of the skull (Huxley).
570 페이지 - Man-like in bulk (sometimes reaching the height of five feet six inches), in the proportions of the leg to the body and of the foot to the hand, in the size of the heel, the form of the pelvis and shoulder-blade, and volume of brain.

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