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



In the 1940 increment of TTJ 2-1 1 (table 33), the lens as seen in 

 cross section is a concurrent series of two at 50 cm. ; a very long 

 single at 2^"] cm. ; and a shorter single at 26 cm. The lens of 1942 be- 

 comes progressively less sharp outward. 



Table 34.— TTP 20-2 Table 35.— TTP 20-4 



44 cm. 24 cm. 12 cm. 34 cm. 19 cm. 



1938 ... I see 2 dee dw 1937 i msec i dee 



I dee (ist) ddw 



1939 ... I see I see i see 1937 i msee i see 



I dL I psce I dee (?) (2d) 2 msL i dee 



1938 I msee i msee 



2 sL 



Table 36.—TTP 20-16 



18 cm. 14 cm. 9 cm. 3 cm. 



1943 I see I see i see 



I sL I dL I dL 



1944 I see I see i see i see 



I sL I psL I dL 



I dL 



Nine cm. from the tip of the branch in the specimen TTP 20-16 

 (table 36), the diffuse lens of 1943 has all but disappeared. 



Table 27.~TTP 20-26 



3.1 cm. 0.7 cm. 



1944 2 see I see 



In TTP 20-26 (table 37), the one growth layer undoubtedly disap- 

 pears because it ends outward, which is to say that two diameter 

 flushes represent one tip flush. 



Table 38.— TTP 20-33 Table 39.— TTP 21-9 



II cm. 6.5 cm. 2.7 cm. 35 cm. 23 cm. 

 1943 ... I see I see 1938 i see i msee 



I dee I d arc 



see I see 



ddw ddw I d arc ddw ddw 



1940 I msee i see 



1944 ... I see I see i see i psce i psce 



It is not uncommon to find annual contacts diffusing outward. In 

 1940 of TTP 21-9 (table 39), as in many other branches, the annual 

 contacts become diffuse inward on the branch. 



