. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. 40 ELEMENTARY STRUCTURE OF \IZED BODIES. 46. The tissues above enumerated clifTer from each otlieimore widely, in proportion as they are examined in animalsof a higher rank. As we descend in scale of being,the diHerences become gradually eflliced. The soft bodyof a snail is much more uniform in its composition thanthe body of a bird or a quad
. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. 40 ELEMENTARY STRUCTURE OF \IZED BODIES. 46. The tissues above enumerated clifTer from each otlieimore widely, in proportion as they are examined in animalsof a higher rank. As we descend in scale of being,the diHerences become gradually eflliced. The soft bodyof a snail is much more uniform in its composition thanthe body of a bird or a quadruped. Indeed, multitudesof animals are known to be made up of nothing but cellsin contact with each oiher. Such is the case with ; yet they contract, secrete, absorb, and repro-duce; and most of the Infusoria move freely, by means oflittle fringes on their surface, arismg from a peculiar kindof cells. 47. A no less remarkable unifoimity of structure is to beobserved in the higher animals, in the earlier periods oftheir existence, before the body ha& ^rrived at its definiteform. The head of the adult sabr,jn, for instance, con-tains not only all the tissues we have mentioned, namely, bone, cartilage, muscle, nerve, brain,
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