BOOKS AND CURRENT LITERATURE 243 



ondary x.vlem was found as described for Psilotiim. The writer con- 

 cludes with remarks on the relationships of Tmesipteris. 



In the opinion of the reviewer, the importance of the material in- 

 vestigated merits more careful work in illustrations. Inked lines are 

 often incomplete, irregular in breadth, and are omitted altogether from 

 the angles of marginal cells of several figures. The writer also is to be 

 criticized for his use of "loose" terminology. The term "plant" obvi- 

 ously applies to the gametophyte as well as to the sporophyte, yet he 

 uses it for the sporophyte only. It is to be regretted that complete 

 series of sections could not have been obtained from such an abundance 

 of material, especially in the study of the early embryo. However the 

 paper is a very valuable one, and doubtless the writer will be able in 

 later work to close the gaps. — J, G. Brown. 



