102 Forestry Quarterly 



for other stands, other regions, and other kinds of thinnings and 

 that their results must be closely correlated with practical obser- 

 vation before the final conclusion is reached. 



F. D. 



Jahrring und Licht. Zeitschrift fur Forst- und Jagdwesen. August and 

 September, 1914, pp. 445-472; 519-538. 



Europe has been importing American tree 



Exotics species since 1601. So far White pine and 



in fir have proven most successful. Pinus 



Germany strobus has now become practically a native 



of Southern Germany, so successful has been 



its acclimatization. Red fir was introduced in 1831 and has proved 



itself a valuable species for German conditions showing the same 



rapid growth as it does in the Northwest. 



Other species which have been successful in Germany are Pinus 

 monticola, Sequoia gigantea, Thuja plicata, Chamaecyparis 

 lawsoniana. Among the hardwoods the walnuts and hickories 

 have been most successfully planted. Red fir and White pine 

 {Pinus strobus) are about the only species, however, that have been 

 planted on a large scale. So many stands of White pine are there 

 that Germany now sends over to this coimtry seeds and seedlings 

 of this species. Four hundred hectares have been planted with 

 Red fir in Prussia and one million hectares in Bavaria. 



The acclimatization of exotic species has shown clearly that 

 there are four factors to be considered in such work: 



(1) Species must be chosen from the right climate and in deter- 

 mining this there should be little trouble where Mayr's climatic 

 parallels are used. 



(2) The second factor of importance is in the securing of seed 

 from a suitable part of the range of species. For example, Red fir 

 from northwest Washington has proven most satisfactory for 

 German conditions whereas it is a waste of time to use seeds from 

 the Rocky Mountain form. 



(3) Proper site conditions. 



(4) Proper handling of seed and seedlings. 



K. W. W. 



AnbauvonExoten. Forstliches Centralblatt. August and September, 1914. 

 Pp. 405-434. 



