153 FLOWER-GARDENING. 



334. It is to avoid the bad effect of evaporation that leaves 

 are usually for the most part removed from a cutting, wheu 

 it is first prepared. 



XIY. SCIONS. 



335. A Scion is a cutting (311) which is caused to grow 

 upon another plant, and not in the earth. 



336. Scions are of two sorts : scions properly so called, and 

 buds (354). 



337. Whatever is true of cuttings is true also of scions, all 

 circumstances being equal. 



338. When a scion is adapted to another plant, it attracts 

 fluid from it for the nourishment of its leaf-buds until they can 

 feed themselves. 



339. Its leaf-buds, thus fed, gradually grow upwards into 

 branches, and send woody matter downwards, which is analo 

 gous to roots. 



340. At the same time, the cellular substance of the scion 

 and its stock adheres (19), so as to form a complete organic 

 union. 



341. The woody matter descending from the bud passes 

 through the cellular substance into the stock, where it occupies 

 the same situation as would have been occupied by woody mat 

 ter supplied by buds belonging to the stock itself. 



342. Once united, the scion covers the wood of the stock 

 with new wood, and causes the production of new roots. 



343. But the character of the woody matter sent down by 

 the scion over the wood of the stock being determined by the 

 cellular substance, which has exclusively a horizontal develop 

 ment (73), it follows that the wood of the stock will always 

 remain apparently the same, although it is furnished by the 

 scion. 



344. Some scions will grow upon a stock without being able 

 to transmit any woody matter into it ; as some Cacti. 



345. When this happens, the adhesion of the two takes 



