General principles of zoology . cA c. FIG. io.—Tail-fins of various fishes. (From Zittel.) ch, chorda, a, 6, c; cover-plates. C,D, Homocercal fins, C, of Amiacaira ; D, of Trutta salar. (By a still greater upwardbending of the notochord and vertebral column the dorsal portion has almost entirelydisappeared and the ventral portion almost alone forms the fin, externally apparentlysymmetrical, but in its internal structure very asymmetrical.) Study of the Distribution of Animals.—Finallynow in regard to Animal Geography: here we learn thatthe present state of distribution of animals is the produc
General principles of zoology . cA c. FIG. io.—Tail-fins of various fishes. (From Zittel.) ch, chorda, a, 6, c; cover-plates. C,D, Homocercal fins, C, of Amiacaira ; D, of Trutta salar. (By a still greater upwardbending of the notochord and vertebral column the dorsal portion has almost entirelydisappeared and the ventral portion almost alone forms the fin, externally apparentlysymmetrical, but in its internal structure very asymmetrical.) Study of the Distribution of Animals.—Finallynow in regard to Animal Geography: here we learn thatthe present state of distribution of animals is the productof past hundreds and thousands of years. It will thereforebe possible from this to figure out many of the earlier con-ditions of things, if one proceeds with the utmost cautionand after overcoming extreme difficulties. If we assume that from the beginning all animal specieswere constituted as they now are, they would then havebeen placed by the purposeful Creator in the territoriesbest suited to their organization ; their distri
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
