IX] 



EXTENSION OF SHOOT 



67 



It will thus be clear that the extension of the shoot 

 depends essentially on the successive extension of inter- 

 nodes by growth in length, and it is a general rule tliat 

 the extension begins slowly in the spring, then reaches a 



Fig. 46. Diagram of a shoot in the second year of its growth. 

 13 leaf-scars of the preceding year ; Ba scars of bud-scales of the term- 

 inal bud and bs those of axillary buds of the preceding year. Shoot above 

 Bs the terminal shoot, and I^III axillary shoots of the present year. 



maximum rapidity in early summer, and then slows down 

 again towards the end of the growing season. Then the 

 extended shoot goes to rest again, and its buds pass into 



52 



