206 



THE GREEN-HOUSE. 



operation a few times, than from several pages of 

 description. 



The success of grafting, whatever kind be em- 

 ployed, depends chiefly on the exact union of the 

 inner bark of the scion with the inner bark of the 

 stock, by which means the sap is enabled to ascend 

 from the soft wood or alburnum of the latter through 

 that of the former, and to return in like manner 

 through their united barks. The other requisites to 

 success are of inferior consequence, but still deserve 

 attention : they are that the sap of both scion and stock 

 must be in motion, and that nearly in the same degree 

 in each ; and that the operation be performed with 

 celerity. 



In grafting, it has been observed that the nearer 

 the graft is made to the root of the stock, so much 

 greater is the probability of success. Hence green- 

 house and other rare plants are sometimes grafted 

 very low, and sometimes even on the roots. When 

 low, in addition to claying, the graft is earthed up to 

 the upper edge of the clay, or the lowest bud of the 

 scion, , and this is found of great use by preserving an 

 equable degree of moisture, and preventing much 

 waste by transpiration. Another advantage of low 

 grafting in the green-house is, that the plant can be 

 covered with a cap or bell glass, which is always of 

 advantage. 



As we have described a mode of inarching nearly 

 allied to grafting, as practised by Mr. Gushing, so we 

 shall here describe a mode of grafting nearly allied 



