Books and Current Literature. 75 



Ewart will be indispensable in further efforts to combat the intro- 

 duction and spread of the pests which it enumerates. 



The Pteridophytes of Ohio, by John H. Schaffner, bearing 

 date of January, 1910, has been published in the proceedings 

 of the Ohio State Academy of Sciences. The census of the species 

 includes: 



Ferns, 44 species. 



Equiseta, 8 species. 



Lycopods, 6 species. 



Water Ferns, 1 species. 



Selaginellas, 2 species. 



The glossary and index add to the value of this carefully 

 prepared and convenient little manual. 



