REVIEWS 427 



that "small burns surrounded by standing timber . . . reproduce 

 readily to birch in addition to the aspen ... a nurse crop under 

 which the more tolerant hardwoods and softwoods enter." 



The two last tables (XVIII and XIX) in the publication are, re- 

 spectively, a volume table (by log lengths) of yellow birch, Scribner 

 rule, and what is incorrectly headed a "yield table" for yellow birch, 

 since it is not on an acre basis, but shows, by decades, the growth of 

 the individual tree in d.b.h., in total height, in clear length, in merchant- 

 able length, and in board foot contents. In the table of contents this 

 table is correctly described as "Growth of Yellow Birch in Virgin 

 Stand." This is ®ne of the few technical slips in the bulletin. 



The "bibliography" which concludes the bulletin is not worthy the 

 name, since it lists only Bulletins 26 and 30 of the old Division of 

 Forestry.. Much water has flowed over the dam since that time as the 

 authors well know, having themselves contributed not a little to the 

 literature on this subject. The omission of the U. S. D. A. Bui. 285, 

 "The Northern Hardwoods," is particularly striking. 



Taken in its entirety, this publication does more to clarify the silvi- 

 cultural side of our intricate Adirondack hardwood problem than any- 

 thing hitherto published. The authors have rendered a real service 

 to their profession. A. B. R. 



Vest-Amcrikanskc traeslag for Norges skogbnik. Thomas Stang, 

 Kristiania, Norges. Pp. 25. 1920. 



An English translation of Stang's interesting article on West-Amer- 

 ican tree species for growing in Norway has recently come to hand. 

 While in America studying forestry the author traveled in the West and 

 became interested in the possible economic use of a number of Pacific 

 Coast species for use in Norway, particularly in its central and eastern 

 parts. The climatological studies discussed in his paper were prelim- 

 inary to securing seeds of at least six species from localities in the West 

 that appeared to warrant their use in particular localities in Norway. 



The researches of Engler, Zederbauer, Dengler, Ceislar, Kienitz. 

 Hiiffel, and others show that success in artificial regeneration depends 

 very largely upon the origin of the seed. Engler goes so far as to state 

 that the failures in Scotch pine in Switzerland have been due almost 

 entirely to collecting seed in wrong localities. We are coming to 

 appreciate that forest tree seed collected in other countries from where 



