FLOWER-GARDENING. 161 



are absent ; or, if they never lose those organs, as evergreens, 

 only at seasons when the atmosphere is periodically charged 

 with humidity for some considerable time. 



367. Old trees, in which the roots are much injured, form 

 new ones so slowly that they are very liable to be exhausted 

 of sap by the absorption of their very numerous young buds 

 before new spongioles can be formed. 



368. The amputation of all their upper extremities is the 

 most probable prevention of death ; but in most cases injury of 

 their roots is without a remedy. 



369. Plants in pots, being so circumstanced that the spon- 

 gioles are protected from injury, can, however, be transplanted 

 at all seasons without any dangerous consequences. 



