22 STRUCTURAL AND PHYSIOLOGICAL BOTANY. 



175. Both corms and bulbs are reservoirs of nutriment in 

 either a starchy or mucilaginous condition, or both. 



176. Leaf-buds are of two kinds, the regular and the adven- 

 titious. 



177. Regular or normal Leaf-buds are only found in the 

 axils of leaves. 



178. They exist in a developed or undeveloped state in the 

 axils of all leaves, and of all modifications of leaves. 



179. Therefore they may be expected to appear at the 

 axils of scales of the bud, of stipules (223), of bracts (274), of 

 sepals (335), of petals (336), of stamens (348), and of carpels 

 (406) ; in all of which situations they are generally undeveloped, 

 for these different organs are all modifications of leaves. 



180. They are frequently not called into action, even in the 

 axils of leaves. 



181. As regular buds are only found in the axils of leaves, . 

 or of their modifications, and as branches are always the de- 

 velopement of buds, it follows, that, whatever may be the 

 arrangement of the leaves, the same will be the disposition of 

 the branches ; and vice versa. 



182. This corresponding symmetry is, however, continually 

 destroyed by the unequal developement of the buds. 



183. Leaf-buds which are formed among the tissue of plants 



