Current Literature. 699 



forests in the Islands and the areas explored by the Bureau during 

 the period of 1908-1910. 



In Part II popular descriptions are given of 106 of the different 

 merchantable trees of the Philippine Islands. Brief mention is 

 also made of about 2yy other trees common in the forests and 

 fields. 



The descriptions were made largely in the forest from living 

 trees, checked in the laboratory with herbarium material. The 

 idea has been to furnish a description by means of which the 

 trees in the forest could be readily distinguished without reference 

 to the flowers and fruiting bodies. No key is given. 



The author states that the tallest tree yet measured in the 

 forests of the Islands had a height of 200 feet. It is probable 

 however that some trees may reach a height of 230 feet. Very 

 few species reach a diameter in excess of six feet. 



A list of the principal forest trees, giving the family name, 

 species, official common names and the usual trade names accom- 

 panies the report. 



Both parts will be of great value to lumbermen, foresters and 

 others interested in the forest resources of the Islands. 



R. C. B. 



Die Grundlagen der rdumlichen Ordnung im Walde. By Pro- 

 fessor Christoph Wagner. 1907. 320 pp. 



Although Wagner's book has already been reviewed in the 

 Forestry Quarterly, a further discussion of the silvicultural princi- 

 ples advanced by the author is desirable in view of their possible 

 application to our own conditions. 



Professor Wagner's book has created a sensation in Europe, as 

 he touches upon silvicultural practices which vitally affect every 

 forester. The author points out clearly the defects of the Euro- 

 pean silvicultural practice of to-day, and advocates a return to 

 nature and to natural reproduction. He advances a silvicultural 

 system of cutting entirely his own which secures natural repro- 

 duction and which makes forest management possible on small 

 areas. 



Wagner points out that in forestry there are two opposing prin- 

 ciples : the natural and the economic. The natural principle tends 



