26O PROCESS OF DEVELOPEMENT. CHAP. IV. 



juice, which has been elaborated in the leaves of 

 preceding buds, and originally in those of the plume- 

 let ; as the young bud does not make its appearance 

 till the leaves df the preceding buds have expanded, 

 and will not ultimately succeed if deprived of them 

 too soon. 



But from the period of its first formation during 

 the course of that summer to that of its final expan- 

 sion in the following spring it continues gradually 

 and constantly to augment in size ; its progress 

 being visible by dissection even in the course of the 

 winter, and accelerated as the spring advances, till 

 at last its bonds are loosened and the scales ex- 

 panded, protruding both leaf and flower. 

 Bulbs. Bulbs are so very similar to buds both in their 



origin and developement as to require no specific 

 investigation. The parent bulb produces an offset 

 analogous to the bud, which attains to maturity about 

 the time of the maturity of the flower, and which 

 finally detaches itself and forms a new individual ; 

 in which last property it differs essentially from the 

 bud, which does not detach itself spontaneously, 

 and can but rarely be made to vegetate if detached 

 by art. 



SUBSECTION V. 



How aug- The Leaf. When the leaves burst from the ex- 

 panding bud, and even Jong before that period, as may 

 be seen by the dissection of the bud in the winter, 



