62 MORPHOLOGICAL DEVELOPMENT. 



the forthcoming parts, while they are very small and un- 

 specialized. What will in 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-undrfferentiated 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 Phaonogams 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 into the matter, we shall find that the axillary buds 

 are interpretable 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 primary 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 prolification is repeated. Besides being shown 

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

 become habitual ; vre are also shown that it may become a 

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



