NO. I GROWTH LAYERS IN TREE BRANCHES — CLOCK ET AL. 



211 



<U d) V i) 

 (J o o o 



crt t/1 (/) (Al 



rt ^ o -O 



VO + + 



« + 



rt X5 U T3 







C/} C/3 C/3 



rt rt j:i u 



nj J3 o -o 



N + + 



' n; (u <u 



CO CO </3 



„ to CO 



