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rainfall and temperature, locally varied by the condition 

 and composition of the soil. It should be remembered too, 

 that by a long continued process of natural selection, nature 

 has produced for each and every region, the species and 

 varieties of trees which are there best adapted to flourish. 

 This should be carefully considered in making plantations; 

 for any attempt to force trees to grow in uncongenial soil or 

 climate is a crime against nature which she will not toler- 

 ate. Thus it will be seen that the question is not one of 

 geography merely. We cannot say that a tree will flourish 

 here solely because its native habitat is within our lati- 

 tude, for other conditions are to be considered. 



A glance at a map of the northern hemisphere, shows us 

 that the configuration of the east coast of the continent of 

 Asia is quite similar to that of eastern North America, and 

 that in tlie Pacific ocean, as well as in the Atlantic, a warm 

 ocean current, commences at the south west and flowing 

 across the ocean, disappears at the northeast. Therefore 

 the coast climate of our continent closely resembles that of 

 the other ; the climate of north eastern Asia, resembling 

 that of New England and eastern North America, while 

 that of California and Oregon is not unlike the climate of 

 western Europe. There are also in various portions of the 

 globe, certain conditions which tend to produce local 

 climates quite different from the surrounding regions, and 

 in some respects, similar to our own. 



Working with these facts, we may arrange in order the 

 regions from which we are obliged to select trees for culti- 

 vation in New England, and beyond which, unless in rare 

 exceptional cases, it is useless to go to add to our collections. 



The order is as follows : — * 



First. The North Atlantic region of America, which in- 

 cludes New England and Canada, and extends southward 

 to the mountains of northern Georgia and Alabama, and 



* Tliese points are more fully treated in a paper by the present 

 writer, read before the Mass. Horticultural Society, 1881. 



