. The causes and course of organic evolution; . viOAa\\^ VltiAHV) \()ZVX3I\ Z(>J.()H,] CHAPTER XVII THE EVOLUTION OF ANIMALS (Continued) There remains for consideration in this chapter the possibleorigin of mammals from simpler types. This inquiry narrowsitself essentially to the batrachian (amphibian) origin thatHuxley advocated, or to the reptilian origin that most recentnaturalists have favored. The writer can not refrain fromexpressing the opinion that in the past discussion of this ques-tion too much emphasis seems frequently to have been laidon minor bones of the osseous system, that
. The causes and course of organic evolution; . viOAa\\^ VltiAHV) \()ZVX3I\ Z(>J.()H,] CHAPTER XVII THE EVOLUTION OF ANIMALS (Continued) There remains for consideration in this chapter the possibleorigin of mammals from simpler types. This inquiry narrowsitself essentially to the batrachian (amphibian) origin thatHuxley advocated, or to the reptilian origin that most recentnaturalists have favored. The writer can not refrain fromexpressing the opinion that in the past discussion of this ques-tion too much emphasis seems frequently to have been laidon minor bones of the osseous system, that often appear anddisappear in mammalian groups. Further the question ofdentition has been so emphasized as a safe guide that otherimportant evidence is often ignored. Again the fragmentaryparts of fossil remains have at times had large generalizationstacked on to them—in some cases very appropriately, in othercases with doubtful results. Finally the lack of soft partsin fossil forms often cuts off from us important means of reach-ing valid
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