62 MOBPHOLOGICAL DEVELOPMENT. 



the forthcbming parts, while they are very small and uii- 

 specialized. What will ia such case be the appearances they 

 assumed ? We shall have no difficulty in perceiving what it 

 will be, if we take a form like that shown in Fig. 92, and 

 dwarf its several parts at the same time that we generalize 

 them. Figs. 100, 101, 102, and 103, will show the result ; 

 and in Fig. 104, which is the bud of an exogen, we see how 



clear is the morphological correspondence : a being the 

 rudiment of a foliar organ beginning to take shape ; b being 

 the almost formless rudiment of the next foliar organ ; and 

 c being the quite-undifferentiated part whence the rudiments 

 of subsequent foliar organs are to arise. 



And now we are prepared for entering on a still- remaining 

 question respecting the structure of Phffinogams — what is the 

 origin of axillary buds ? As the synthesis at present stands, 

 it does not account for these ; but on looking a little more 

 closely iato the matter, we shall find that the axillary buds 

 are intei-pretable in the same manner as the terminal buds. 

 So to interpret them, however, we must return to that pro- 

 cess of proliferous growth with which we set out, for the pur- 

 pose of observing some facts not before named. Delesseria 

 hypoglossum, Fig. 105, represents a seaweed of the same genus 

 as one outlined in Fig. 40 ; but of a species in which pro- 

 liferous growth is carried much further. Here, not only does 

 the pi-imary frond bud out many secondary fronds from its 

 mid-rib ; but most of the secondary fronds similarly bud out 

 several tertiary fronds; and even by some of the tertiary' 

 fronds, this proMcation is repeated. Besides being shown 

 that the budding out of several fronds from one frond, may 

 become habitual ; we are also shcwTi that it may become a 

 habit inherited by the fronds so produced, and also by tlw 



