io8 



Table 31. — TTJ 2-4 

 57 cm. 



1939 I see 



2 dee 

 I dL 



1940 2 see 



1941 I see 



I s arc 



In the 1940 increment of TTJ 2-4 (table 31), the outer growth 

 layer comprises one-third on the long radius and one-tenth or less on 

 the short radius of the entire increment. The lightwood of the outer 

 growth layer, at several spots on the short radius, disappears so that 

 the densewood of the inner growth layer lies flush against the dense- 

 wood of the outer growth layer. This suggests that the transition 

 from a complete growth layer to a lens occurs in two steps : first, the 

 disappearance of the lightwood ; and second, the disappearance of the 

 densewood. Transitions of this type apply longitudinally as well as 

 around the circuit of a single cross section. 



Table 2,2.— TTJ 2-5 

 48 cm. 36 cm. 25 cm. 



1940 2 see 2 see i see 



I dee 



1941 I see I see i see 



I dL 



In the 1940 increment of TTJ 2-5 (table 32), the outer growth 

 layer has but a fraction of the thickness of the inner growth layer; it 

 is a so-called "outer thin" growth layer whose "thinness" and weakly 

 developed densewood nearly belies the fact that it is the outward 

 termination of an annual increment. The contact of the outer growth 

 layer weakens outward on the branch. The contact of the inner 

 growth layer is sharp at 48 cm., somewhat indefinite at ^6 cm., and 

 practically invisible at 25 cm. 



1940 



1941 

 1942 



