NO. I GROWTH LAYERS IN TREE BRANCHES — CLOCK ET AL. I3I 



Fig. 38.— TTAp 2-3-b. Increments for 1938-1940. Different number of 

 contacts along different radii; variation of cambial activity in time and place. 



Fig. zg.—XSC 2-1-b. The increment for 1939. Multiplicity; partial gls with 

 compound overlapping lenses. Sequence as follows : _ see ; short sL ; long msL, 

 compound with previous sL ; short sL, compound with previous 2 lenses ; long 

 sL, overlapping previous short sL and long msL. Note that the two outer lenses 

 whose cusps nearly meet are not the product of the same episode of cambial 

 activity. 



