. The causes and course of organic evolution; . Fig. 2—Long. sect, through base of sepal of (a) Philesia, (b) Philagcria thehybrid, (c) Lapageria. gl. gland. If then it be asked wherein one species can be surely sep-arated from another in hereditary relation, we would replythat, if by any environal stimuli some one or more charactersor responses to energy be so replaced or modified by energizingaction of another kind or type that the original character orresponse fails to reappear in the immediate descendants, whilethe new kind or type does, a new species results. But this 186 Causes and Cours
. The causes and course of organic evolution; . Fig. 2—Long. sect, through base of sepal of (a) Philesia, (b) Philagcria thehybrid, (c) Lapageria. gl. gland. If then it be asked wherein one species can be surely sep-arated from another in hereditary relation, we would replythat, if by any environal stimuli some one or more charactersor responses to energy be so replaced or modified by energizingaction of another kind or type that the original character orresponse fails to reappear in the immediate descendants, whilethe new kind or type does, a new species results. But this 186 Causes and Course of Organic Evolution would in no way prohibit the possibihty of the former characterreappearing in the future—and it might be remotely removed—descendants, were the environal stimuli such that the char-acter or type of energy response was again called forth. Butby that time many other alterations or replacements mighthave taken place, so that, when the resubstitution has beeneffected, it no longer is reformed into the exact type of org
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