BTTDS. 



81 



The rings of scars about the twig, shown in Figs. 23 and 59, 

 mark the place where the bases of bud-scales were attached. 

 A little examination of the part of the twig which lies outside 

 of this ring, as shown in Fig. 23, will lead one to the conclu- 

 sion that this portion has all grown in the one spring and 

 summer since the bud-scales of 

 that particular ring dropped off. 

 Following out this suggestion, it *-?, \^S^6 



is easy to reckon the age of any 

 moderately old portion of a branch, 

 since it is equal to the number of 



...-OCC 



% 



"^--J! 



FiO. 59. — A Slowly grown Twig of Cherry, 

 three inches long and about ten years old. 



The more pointed terminal bud is a leaf-bud, 

 the more obtuse accessory buds, ace, are flower- 

 buds. 



Fig. 60. — I, a Twig of European 

 Elm. II, a Longitudinal Section of 

 the Buds of I, considerably magni- 

 fied. 



a, the axis of the bud, which will 

 elongate into a shoot ; 2), leaf-scars. 



segments between the rings. In rapidly growing shoots of 

 willow, poplar, and similar trees, five or ten feet of the length 

 may be the growth of a single year, while, in the lateral twigs 

 of the hickory, apple, or cherry the yearly increase may be 

 but a fraction of an inch. Whatever the amount of this 



