NO. I GROWTH LAYERS IN TREE BRANCHES — CLOCK ET AL. 1 59 



In 1937 of TTP 24-12 (table 95), the densewoods of the intra- 

 annuals are buried in compression wood. The extra growth layer 

 of 1942 at 40 cm. varies from merged densewood, to divided dense- 

 wood, to a lens. Where the densewoods are merged, the inner margin 

 is extraordinarily sharp, and where they divide, the inner margin of 

 the inner band of densewood is sharper than its outer margin. The tip 

 flush for 1942 contains two zones without needles and two zones with 

 needles ; that is to say, two sets of bare-needle zones. 



Table 95.— TTP 24-12 



53.5 cm. 40 cm. 30.5 cm. TF 



1937 I see I 



2 dee 



1938 I see I see 



1939 I see I see i see 



I psce 



1940 I see I see i see 



I psee I dee i dee 



1941 I see I see i see 



1942 I see I see i see 



I psce or I dee 



ddw 



Table g6.— TTP 24-13 



53 cm. 

 1938 I see 



1939 I see 



1940 I see 



I psce 



1941 I see 



1942 I see 



ddw 

 psg 



Intra-annuals of TTP 24-13 (table 96) become fainter outward 

 on the branch. Two sets of bare-needle zones are present in the tip 

 growth of 1942. In 1942, the divided densewood becomes a single 

 lens at 41 cm. and concurrent lenses at 30 cm. The postseasonal 

 growth occurs as very narrow, short, incomplete lenses. 



