THE STRUCTURE OF THE SHOOT 



73 



off. When it is resumed on the putting out of the 

 leaves of the next year this process recommences. 

 There is a difference in appearance between the wood 





FK 



. 29. Section of twig of lime-tree, 3 years old. ix, 2x, 

 the successive annual rings of wood. (After Kny.) 



formed at the end of the season and at the beginning, so 

 that the formation of each year stands out distinct from 

 that of the next, when a transverse section of a twig or 

 branch is examined. Each year's formation is spoken 

 of as an annual ring. The rings of wood are easily seen, 

 but those of bast are not so conspicuous (Fig. 29). 





