104 



If we, then, glance over the American varieties 

 of trees in relation to their value for the German 

 and, incidentally, European forests the most 

 valuable acquisitions, both as regards forest 

 planting and value for sylvicultural purposes are, 

 the Robinia, Weymouth pine, both the Doug- 

 lasias and the Banks pine. With these come 

 next hickory and walnut ; cypresses are hardly 

 likely to become of a greater general value. Such 

 species as are closely related to European firs, 

 pines, ashes, oaks, &c., may turn out useful for 

 sylvicultural reasons in those parts of Europe in 

 which these species of tree are not to be found, 

 but in those localities where these kinds of 

 timber already exist the kindred exotics appear 

 to be superfluous. 



Out of all the general natural laws and methods 

 of raising trees as partly published by Prof. 

 Mayr, and partly given in his lectures on sylvi- 

 culture, both with the cultivation of the native 

 as well as the foreign varieties, the following data 

 are selected with his sanction : 



1. The raising of different kinds of trees is 

 best carried out in small gardens sheltered by 

 the high forest. Where it is desired to sow on 

 open land slight protection should be given. 



2. Sowing with indigenous kinds can be done 

 later than in the case of foreign trees, for which 

 autumn or spring sowing in April is advisable. 



