48 



29. ChamcBcyparis spkcsroidea, Spach., Spherical 

 Cypress, Swamp Cypress, White Cypress. 



This tree is to be found in parks. Its im- 

 munity to frost made Mayr consider this species 

 to be well worth trying in the forest at a height 

 of 540 metres above sea-level. Experiments in 

 growing it are so far, however, of a very iso- 

 lated character. 



30. Ptcea alba, Link, White Pine, White Spruce. 



This spruce, which is in great favour as an 

 ornamental tree, is in no way superior to the 

 indigenous spruce as a forest tree. Experiments 

 are only being made with it in the Austrian Alps. 



31. Pinus banksiana, Lamb, Banks Pine, Jack 



Pine, Scrub Pine. 



It was Mayr ^ who first called attention to the 

 super - excellent sylvicultural qualities of this 

 species of timber tree, the result being that its 

 cultivation was begun on a large scale all over 

 Germany, Russia, Austria, and even in America 

 itself. In Prussia alone in the year 1900, that is, 

 TO years after Mayr's book appeared, 12 hectares 

 were under cultivation, and the area is not less 

 outside Prussia. One single firm (Hein, of 

 Halstenbeck) sold in quite a few years some 

 5,000,000 Banksia plants. As a preparatory tree 

 ' "Die Waldungen von Nord-Amerika," Miinchen, 1890. 



