753 JOURNAL 01' FORESTRY 



The authors state that the employment of this tree will render profit- 

 able the afforestation of large tracts of poor health land in England 

 which would only yield a slight return if planted with any other species 

 or if placed under cultivation for agricultural purposes. Plantations 

 of this tree at Westwick, England, 20 years old, are exceedingly 

 thrifty and 40 feet high. 



The juvenile height growth of the Colorado tree in Great Britain 

 is about one-half that of the Pacific coast tree. It is asserted that in 

 America the former seldom attains a greater height than 80 to 90 

 feet while the latter may exceed 300 feet, and the inference is drawn 

 that the variation in height in England in the two trees as shown in 

 their early life, will continue until their principal height growth is 

 attained. The total volume of the Pacific coast tree in a given length 

 of time is given as roughly eight times that of the Colorado tree. In 

 England the latter is said to be practically immune from attack by a 

 species of Chermes which is now spreading to an alarming extent on 

 the former. 



The variety of Douglas fir, Pseiidotsnga Douglasii, var. cccsia^ 

 Schwerin, was first described in 1907 and attains a height of 100 to 150 

 feet. The type material was collected in the interior of British Co- 

 lumbia where the climate is cold and dry. Its range extends into north- 

 eastern Washington, northern Idaho and northwestern Montana in the 

 United States. It is slow growing like the Colorado tree. Manna is 

 said to occur on the foliage and branches of this variety of the Douglas 

 fir in the dry belt of British Columbia. Trees of this variety have been 

 raised in German nurseries, and have been planted both in Germany 

 and England and are able to weather more severe climatic conditions 

 than the typical form of this species. 



Pseudotsuga macrocarpa, Mayr, as well as the four Asiatic species 

 are of limited distribution and of minor economic importance. The 

 Asiatic species of which one is Japanese, two Chinese and one For- 

 mosan, appear to be well differentiated although it is probable that the 

 Formosan species P. Wilsoniana, Hayata, is identical with P. sinensis,. 

 Dode, of northeast Yunnan, China. The other Chinese species, P. 

 Forrestii, Craib., has longer and larger leaves and although little known 

 merits introduction into this country for decorative use. It has been 

 introduced into cultivation at Edinburgh, Scotland. 



The Japanese species, P. japonica, Boissner, is a small, relatively 

 unimportant rare tree, and has not to the reviewer's knowledge been 



