B MORPHOLOGICAL DEVELOPMENT. 



the original series, we arrive at a structure like that of the 

 terminal bud; by dwarfing and generalizing a lateraj series, 

 as shown in Figs. 107 110, we arrive at a structure an 

 swering in nature and position to the axillary bud. 



JO / 



Facts confirming these interpretations, are afforded by 

 the structure and distribution of buds. The phsenogamic 

 axis in its primordial form, being an integrated scries of 

 folia ; and the development of that part by which these folia 

 are held together at considerable distances from one another, 

 taking place afterwards ; it is inferable from the general 

 principles of embryology, that in its rudimentary stages, the 

 phoonogamic axis will have its foliar parts much more clearly 

 marked out than its axial parts. This we see in every bud. 

 Every bud consists of the rudiments of leaves packed to 

 gether without any appreciable internodal spaces ; and the 

 internodal spaces begin to increase with rapidity, only when 

 the foliar organs have been considerably developed. More 

 over, where nutrition is defective, and arrest of development 

 takes place that is, where a flower is formed the inter- 

 nodes remain undeveloped : the process of unfolding ceases 

 before the later-acquired characters of the phacnogamic axis 

 are assumed. Lastly, as the hypothesis leads us to expect, 

 axillary buds make their appearances later than the foliar 

 organs which they accompany ; and where, as at the ends of 

 axes, these foliar organs show failure of chlorophyll, the 

 axillary buds are not produced at all. That these are in 

 ferable traits of structure, will be manifest on contemplating 

 Figs. 106 110; and on observing, first, that the doubly- 

 proliferous tendency of which the axillary bud is a result, im 

 plies abundant nutrition ; and on observing, next, that the 

 original place of secondary prolification, is such that the foliar 



