30 
James Small. 
The elucidation of the principle of physiological differentiation 
and restriction of area enables us to understand many peculiarities 
of distribution. 
The usefulness and fundamental truth of the Law of Age and 
Area in its wider application to absolute age and total area are 
demonstrated with a considerable degree of certainty by the 
striking way in which the action of the law can be traced as agreeing 
with the phyletic conclusions based on the floral morphology and 
physiology of the family. 
BIBLIOGRAPHY X. 
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