. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. !i- I'J 40 COMPARATIVK PIIYSIOLOOY. Thus, certain beetles reaenible bees aud wanpH, wliich latter are protecte<l by atinga. It ia believed that auoh groupa uf beetles aa theae ar»ae by a species of selection ; those escaping enemies which chanced to resemble dreaded insects most, so that birds which wore accustomed to prey on beetles, yet feared bccH, would likewise avoid
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. !i- I'J 40 COMPARATIVK PIIYSIOLOOY. Thus, certain beetles reaenible bees aud wanpH, wliich latter are protecte<l by atinga. It ia believed that auoh groupa uf beetles aa theae ar»ae by a species of selection ; those escaping enemies which chanced to resemble dreaded insects most, so that birds which wore accustomed to prey on beetles, yet feared bccH, would likewise avoid the mimicking forms. 4. BudimMltMry OrgUU.âOrgans which were once func- tional in a more ancient form, but serve no use in the creatures in which they are now found, have reached, it is thought, their rudimentary condition through long periods of comparative disuHO, in many generations. Buch arc the rudimentary mus- cleH of the ears of man, or the undeveloped incisor teeth found in the upper jaw of ruminants. 6. OMJgpraphioal Diltribatioil.âIt can not be said that ani- mals and plants are always found in the localities where they are best fitted to flourish. This has been well illustrated within the lifetime of the present generation, for the animals intro- duced into Australia have many of them so multiplied as to displace the forms native to that country. But, if we assume that migrations of animals and transmutations of species have taken place, this difficulty is in great part removed. 6. Paleontology.â^The rocks bear record to the former exist- ence of a succession of related forms; and, though all the in- termediate links that probably existed have not been found, the apparent discrepancy can be explained by the natiue of the circumstances under which fossil forms are preserved ; and the " imperfection of the geological ; It is only in the sedimentary rocks arising from mud that fossils can be preserved, and those animals alone with hard parts
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