CUTTINGS. 69 



Unless the cutting has great vitality and 

 power of forming adventitious leaf-buds, which 

 sometimes happens. 



An eye is a leaf-bud without an internodium. 



It only differs from a cutting in having no 

 reservoir of food on which to exist, and in 

 emitting its roots immediately from the base of 

 the leaf-bud mto the soil. 



As cuttings will very often, if not always, 

 develope leaves before any powerful connec- 

 tion is formed between them and the soil, 

 they are peculiarly liable to suffer from perspi- 

 ration. 



Hence the importance of maintaining their 

 atmosphere in an uniform state of humidity, as 

 is effected by putting bell or other glasses over 

 them. 



In this case, however, it is necessary that 

 if air-tight covers are employed, such as bell 

 glasses, they should be from time to time re- 

 moved and replaced, for the sake of getting 

 rid of excessive humidity. 



Layers differ from cuttings in nothing ex- 

 cept that they strike root into the soil while yet 

 adhering to the parent plant. 



Whatever is true of cuttings is true of layers, 

 except that the latter are not liable to suffer by 



