NO. I GROWTH LAYERS IN TREE BRANCHES — CLOCK ET AL. 1 79 



1940, and cut off June 12, 1940. In the 1938 increment, the diffuse 

 growth layer fades outward. In the 1939 increment, the sharp lens 

 of 65 cm. becomes diffuse at 50 cm. but sharpens on several radii at 

 36 cm. The densewood of the annual border at 50 cm. weakens so 

 much that it appears to be diffuse when viewed under low power. 



Table 128— XSJf 2-1 



61 an. 50 cm. 36 cm. 



1937 I see I see i see 



arcs arcs ares 



1938 I see 1 see i see 



I dee I dee i dee 



1939 I see I see i see 



I dee I dee i dee 



1940 I see I see i see 



ddw ddw ddw 



inc ine L's inc 



XSJf 2-1 (table 128) was frozen artificially at 50 cm. on May 10, 

 1940, and was cut off June 12, 1940. The compression wood of 1937 

 carries numerous arcs of narrow cells. In the 1938 and 1939 incre- 

 ments, the diffuse intra-annuals become more diffuse and fainter out- 

 ward on the branch. The sharpness of the divided densewood at 61 

 cm. of 1940 fades outward. 



Table 129. — XSP i-i 



49 cm. 



1937 I see 



1938 I see 



I sL 



1939 I see 



1940 I sL 



ine L 



XSP I-I (table 129) was frozen artificially at 33 cm. on May 10, 

 1940, and was cut off June 12, 1940. In the 1938 increment, the sharp 

 lens at 49 cm. is reduced to divided densewood at 33 cm. and has dis- 

 appeared before reaching 19 cm. The sharp, complete, entire growth 

 layer of 1940 at 33 cm. actually possesses lenticular lightwood. 



