258 HISTORY OF FRUITS. 



night freezes the sap in the vessels which contain it, and 

 causing it to expand, thus tears the vessels asunder, and 

 brings on a decay of that part of the branch/' 



This particularly points out the necessity of protecting 

 these trees in the spring; but where it is not convenient to 

 do so, the snow should be removed from the branches by 

 a pair of kitchen bellows, as by using a brush there would 

 be danger of injuring the buds. 



Where these trees are grown in tubs for the purpose of 

 forcing, we should recommend the square-shaped box with 

 a divided door on each side, which would give an opportu- 

 nity of refreshing the roots with new mould, without re- 

 moving the plants, and this should be done some time 

 before they are removed into the hot-house. By this 

 means of conveying nourishment, most large housed trees 

 may be kept in a vigorous state. 







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