ON THE STRUCTURE OF BUDS 139 



Lateral and secondary buds occur frequently in the 

 lower part of the primary bud, in positions correspond- 

 ing to the axils of primary but aborted leaves. They 

 have the same structure as the primary ones, but are 

 much simpler, and consist of a few pairs of stipules, 

 the outer ones of which are comparatively large. These 

 buds appear but seldom or ever to become developed 

 into branches on the expansion of the primary bud, but 

 remain small. Accidents to the primary bud, however, 

 would, of course, cause them to develop. 



The following is the composition of a flower-bud 

 that is, one containing catkins : 



The lirst fourteen pairs of stipules, or thereabouts, 

 have neither leaves nor catkins, so that they merely 

 serve the purpose of protection. 



The first five pairs of stipules are very small and 

 rounded ; the first pair are often acuminate or 

 tailed. 



The sixth and seventh pairs are twice as large, 

 roundly triangular, concave, and finely ciliate. 



The eighth and ninth pairs are half the length of 

 the bud, triangular, and obtuse. 



The tenth pair are three-quarters the length of the 

 bud, broadly triangular, subacute, covering a great part 

 of the bud, and pubescent on the back. 



The eleventh and twelfth pairs are as long as the 

 bud, covering three-fifths of it, each stipule covering 

 two faces of it, and the half of one stipule overlapping 



