144 BOTANICAL GAZETTE [FEBRUARY 
of generations in animals, doubtless they would have been thoroughly 
discussed in that book. 
It is hardly necessary to state that the theory has no bearing what- 
ever upon relationships or interrelationships. It merely adds another 
to the already long list of parallel processes, and suggests that the 
theory of alternation of generations in plants is applicable to animals. 
THE UNIVERSITY OF CHICAGO. 
