Abstract
1. Any new species arising during the course of evolutionary change must possess individual members with genetic constitutions ‘harmonious’ enough to ensure survival and maintenance in competition with other species growing in the same habitat. It is not necessary that successful species should display ‘100% efficiency’. 2. Instead of searching, therefore, for some teleological value for isolated features of plant growth, it is suggested that it might be more profitable to focus attention on problems concerning the physiology of the individual plant, and to attempt to appreciate the relation of particular features of development to the other processes occurring simultaneously. 3. For example, a better understanding of the processes involved in polyterpene accumulation in laticiferous plants may require a clearer insight into triterpene metabolism in general.
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