I02 



56. Pinus murrayana, Balfour, 



which has been recommended by Mayr for laying 

 out pure plantations in the high-lying moors. A 

 slight experiment carried out in a small cold 

 position adjacent to a moor has shown this 

 species to be rapid in growth and immune against 

 frost. As these pines, which are related to the 

 Banksian variety, grow to a height of 30 metres 

 on soil adjacent to moors in America, it is recom- 

 mended that further trials with it might be made. 



57. Pinus resinosa, Ait. 



This American red pine belongs to the 

 regions of Eastern North America, and plays 

 there a similar part to that of the red or 

 common pine in Europe. There is no reason 

 for Europeans to cultivate it, and no reason 

 why Americans should seek for another method 

 of treating the red pine than that which its 

 sister in Europe enjoys. 



Retrospect. 



If we survey the collective sylvicultural pecu- 

 liarities of American trees, the first thing to be 

 noted is the immunity to frost of the East 

 American varieties, with which may be ranked 

 those from the Rockies, while those from the 

 Pacific coast, with its moist atmosphere, appear 



