196 TREATISE UPON THE WILD SILK WORMS. 



will resist the winters of France, because it bears the win- 

 ters of Pe-tche-li, which are much longer and much more 

 rigorous. The Chinese adopt a principle in botany and 

 agriculture that deserves to be examined. According to 

 them, when one wishes to preserve the trees and plants of 

 strange countries, the most studied care is necessary for the 

 first plants ; but when one has gathered seed it is easy to 

 propagate them, above all after the second generation. If 

 the seed of the second or third generation do not succeed, 

 it is because the climate is not favorable to those trees and 

 plants ; they can never there naturalize them. Thefagara 

 tree succeeds wonderfully on the mountains in the environs 

 of Peking. Perhaps our winter rains are injurious to them, 

 and it would be advantageous to preserve their roots from 

 dampness, by planting them on the top of a hill, with a 

 southern aspect, and by surrounding them with a small plat- 

 form, such as is made for grape arbors and accacias in 

 many places. 



" 



FINIS. 



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