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NOTICES OF NEW B30KS. 301 



embryo and seedling. The facts presented are based largely ou the 

 author's own observation in the field and laboratory. 



Part III., on the evolution and phylogeny of the group, is somewhat 

 speculative. In tracing the evolution of the female sporophyll from the 

 vegetative leaf the author has a well-defined series to illustrate his 

 point ; but in the brief general discussion of lines of evolution he is 

 compelled to be more vague and is less convincing ; he has left the 

 field and the laboratory in which he has worked so successfully. 



A. B. R. 



