120 THE DEVELOPMENT OF BRITISH FORESTRY 



its growth during the first fifteen or twenty years, or until 

 the leading shoots have reached a higher level than that 

 attained by freezing temperatures in ordinary springs. 



TABLE III 



Extremes of Cold borne by various Exotic Trees 

 WITHOUT Injury in the Winter of 1892-1893, as 

 recorded by the late Dr. Bernard Danckelmann in 

 German3^^ 



Uninjured hy —35° F. 



Abies balsamea. 

 Abies Nordmanniana. 

 Picea sitchensis. 

 Picea pungens. 

 Pseudotsuga Douglasii. 

 Larix leptolepis. 

 Cupressus Lawsoniana 

 Cupressus nutkaensis. 

 Pinus Banksiana. 

 Pinus strobus. 

 Betula lenta. 

 Juglans nigra. 

 Acer dasycarpum. 

 Acer negundo. 

 Acer saccharinum. 

 Fraxinus americana. 

 Quercus rubra. 

 Primus serotina. 



Injured or hilled hy temperatures 

 below -30° F. 



Juniperus communis. 

 Juniperus virginiana. 



Pinus rigida. 

 Thuia gigantea. 



Injured or killed by —23° 

 to -30° F. 



Abies pinsapo. 

 Cryptomeria japonica. 

 Picea polita. 

 Welbngtonia gigantea. 

 Zelkowa Keaki. 

 Prunus avium. 



Injured hy —14° to —22° F. 



Pinus laricio. 

 Pinus ponderosa. 

 Catalpa speciosa. 



Injured by — 6° to — ] 3° F. 



Pinus densifiora. 

 Pinus pinaster. 

 Pinus Thunbergii. 

 Ilex aquifolium. 

 Juglans regia. 



^ Zeitschrift fiir Forst- und- Jagdivesen. August 1894. 



