PRINCIPLES OF ZOOLOGY

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Page 5 - The design of this work is to furnish an epitome of the leading principles of the science of Zoology, as deduced from the present state of knowledge, so illustrated as to be intelligible to the beginning student. No similar treatise now exists in this country, and indeed, some of the topics have not been touched upon in the language, unless in a strictly technical form, and in scattered articles.
Page 50 - The portion of the globe behind the lens, which is much the largest, is filled by a gelatinous liquid, perfectly transparent, like that of the chambers, but somewhat more dense. This is called the vitreous humor, (h.) 77. The object of this apparatus is to receive the rays of light, which diverge from all points of bodies placed before it, and to bring them again to a point upon the retina. It is a well-known fact, that when a ray of light passes obliquely from one medium to another of different...
Page 238 - The link by which they are connected is of a higher and immaterial nature ; and their connection is to be sought in the view of the Creator himself, whose aim in forming the earth, in allowing it to undergo the successive changes which geology has pointed out, and in creating successively all the different types of animals which have passed away, was to introduce man upon the surface of our globe. MAN is THE END TOWARDS WHICH ALL THE ANIMAL CREATION HAS TENDED FROM THE FIRST APPEARANCE OF THE FIRST...
Page 238 - that there is a manifest progress in the succession of beings on the surface of the earth. This progress consists in an increasing similarity to the living fauna, and among the vertebrates, especially in their increasing resemblance to man.
Page 163 - Now, a similar end is accomplished by the working ants and bees, only, instead of being performed as an organic function, it is turned into an outward activity, which makes them instinctively watch over the new generation, nurse and take care of it. It is no longer the body of the nurse, but its own instincts, which become the instrument of the development. This seems to receive confirmation from the fact that the working bees, like the plant-lice, are barren females. The attributes of their sex,...
Page 180 - White-fish, before mentioned, (306,) are two very different fishes ; yet, taking into consideration their external form and bearing merely, it might be questioned which of the two should take the highest rank; whereas the doubt is very easily resolved by an examination of their anatomical structure. The White-fish has a skeleton, and, moreover, a vertebral column, composed of firm bone. The Sturgeon, (Fig.
Page 29 - Complexity of organization, variety, and amount of power are secondary to the degree in which the whole organism is adapted to the circumstances which surround it, and to the work which it has to do. Ascent in the animal scale is not a passage...
Page 238 - ... laid up also for him, in the bowels of the earth, those vast stores of granite, marble, coal, salt, and the various metals, the products of its several revolutions ; and thus was an inexhaustible provision made for his necessities, and for the development of his genius, ages in anticipation of his appearance.
Page 56 - In mammals it is composed of three parts, the external ear, the middle ear, and the internal ear, and its structure is as follows : (Fig.
Page 238 - Agassiz continues, however, in terms characteristic of the creationist school: " But this connexion is not the consequence of a direct lineage between the faunas of different ages. There is nothing like parental descent connecting them. The fishes of the Palaeozoic age are in no respect the ancestors of the reptiles of the Secondary age, nor does man descend from the mammals which preceded him in the Tertiary age. The link by which they are connected is of a higher and immaterial nature; and their...

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