Ctirreut Literature 119 



peated in Europe as well as in North America and Asia. Each 

 of these zones as they occur in America, Europe, and Asia are 

 subdivided into two or three divisions, and lists of the trees 

 characteristic of each division are presented. These lists should 

 be of considerable aid to foresters in selecting exotics to introduce 

 into various parts of the United States as well as Europe. 



Dr. Mayr in the third section of the volume discusses the in- 

 herent capacity of various exotic species to become naturalized 

 and acclimated when shifted from their natural environment. 

 This is followed by a most interesting discussion of the inherent 

 merit of various exotic trees for decorative use and for forestry. 

 He points out that the greatest number of exotic species are 

 chiefly useful for decorative planting, but even here Dr. von 

 Salisch, the father of aesthetic forestry, states only indigenous 

 species can be aesthetically fine. 



The great difficulty that the forester finds in the study of dif- 

 ferent species from uncertainty in nomenclature is clearly pointed 

 out. Numerous illustrations are given showing the great con- 

 fusion in the names of many of our own forest trees. The Kew 

 nomenclature is followed throughout. 



An interesting part of the volume to American foresters is the 

 discussion of the results attained to the present time in the growth 

 of a large number of exotic trees in various parts of Germany, 

 many of which are among the important timber trees of this 

 country. Some of these species have been grown in Europe for 

 a century or more and their relative value as compared with the 

 indigenous species is fairl)^ well known. As to the growth and 

 vigor of the American trees, that have been grown for some time 

 in Germany in forest stands, White Pine, Douglas Fir, Jack Pine, 

 Sitka Spruce, Lawson Cypress, Red Oak, Pin Oak, and White 

 Ash are placed in the first rank. Among those that have been 

 the least successful are the Big Tree, Black Walnut, and Black 

 Locust. 



About one-third of the volume is devoted to a more or less de- 

 tailed description of the exotic species capable of being grown in 

 Europe for both forest and park purposes. No attention, however, 

 is given to varieties and garden forms. Special attention is given 

 to the recognition of species in their juvenile form and diagnostic 

 characters are largely derived from the leaves, buds, and bark. 

 For the most part each species is illustrated by small, poorly 

 executed figures representing but mere scraps of small twigs. 



