FOREST PLANTING. 141 



may be seen by comparison of the East and West coasts 

 of Continents. Europe receives the S. W. winds from 

 the Altantic, and we find the vine and olive growing in 

 the latitude of Boston, which is that of central Spain and 

 Italy. Follow the same parallel to our Western coast 

 and we find in California growing luxuriantly the fruits 

 which in Boston can only be raised under glass, and with 

 artificial heat. 



The same effect, in a less degree, may be observed when 

 the expanse of water is very much less. At Newport, R. 

 I., as is well known, many plants are found to flourish, 

 which in the interior cannot be grown north of Philadel- 

 phia. In Nova Scotia (which, like Rhode Island, receives 

 the S. W. wind directly from the ocean), the English ivy 

 thrives without protection, which in Boston two degrees 

 farther south is annually killed to the ground. It is 

 common to attribute this to the influence of the gulf stream, 

 but the same result is found on the shores of the great lakes. 

 The whole eastern shore of Lake Michigan, from St. Jo- 

 seph to the Grand Traverse region, is the land of the 

 peach and the grape, and of a luxuriant forest vegetation. 

 The S. W. wind has a sweep of sixty miles across the 

 laite before striking the shore, and the result is that for 

 all purposes of cultivation the country is the same as the 

 region about Philadelphia, while the whole western shore 

 from Chicago northward, is utterly incapable of produc- 

 ing the more delicate fruits, and the native forests are 

 comparatively confined to a limited number of varieties, 

 and those of stunted growth. The influence of wood land 

 upon temperature is of the same character as that of a 



