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



Table 42. — Continued 



81 cm. 68 cm. 



1938 I see I see 



I psL I sL (inner) 



I sL (overlapping) 

 I dL 



1939 I see I see 



I sL (part eompound) i sL 

 I msL 



3 PsL 



I dL (part eompound) 



I s iL 

 I d iL 



1940 I see I see 



3 sL 

 I s iL 



ddw 



inc inc 



Branch eut off May 10, 1940. 



Table 43. — XSC 10-2 



51 cm. 44 cm. 38 cm. 28 cm. 



1939 I see I see i see i see 



I psee I dee i dee 



I psL I psL I psL I dee 



1940 I see I see i see i see 



I dee I psee i psee i msL 



I sL I sL I sL 



I psL I psL I psL 



Table 44. — YCt 1-3 

 14 cm. 6 cm. 



1940 4 see 3 see 



I sL 



Tables 5 to 44 give some idea of longitudinal transitions in growth 

 layers. Practically all branch or stem analyses illustrate such transi- 

 tions. However, attention should also be directed to the following 

 tables: 74 (1944) ; 81 (1944) ; §4 (i944) ;85 (1938-40) ; 94 (i940- 

 42) ; 96 (1940) ; 105 (1938) ; 108 (1936-37) ; I09 (1936-38) ; 115 

 (1939) ; 122 (1939) ; 126 (1938) ; and 129 (1938). 



An examination of the tables brings out rather clearly that transi- 

 tion from one type of growth layer to another is not a rare phenome- 

 non. Simplicity of growth-layer pattern within the annual increment 

 may increase either outward or inward on the branch, and the same, 

 of course, holds for an increase of complexity. Or again, simplicity 



