22 LEAF-BUDS. 



medium through which the sap flows in its pas- 

 sage from the roots into the leaves. 



In Exogenous stems it certainly rises through 

 tlie alburnum, and descends through the bark. 



In Endogenous stems it probably rises 

 through the bundles of wood, and descends 

 through the cellular substance ; but this is un- 

 certain. 



Stems have the power of propagating an 

 individual only by means of their Leaf-buds. 

 If destitute of Leaf-buds, they have no power 

 of multiplication, except fortuitously. 



Leaf-buds. 



Leaf-buds are rudiments of branches, en- 

 closed within scales, which are imperfectly 

 formed leaves. 



All the leaf-buds upon the same branch are 

 constitutionally and anatomically the same. 



They are of two kinds ; viz. regular or nor- 

 mal^ and adventitious or latent. 



Regular leaf-buds are formed in the angle 

 of the leaf and the stem, called the axil, at the 

 origin of the leaf — all bodies growing in that 

 angle, are called axillary. 



