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



171 



outer growth layer making the lightwood of the outer lenticular. In 

 Other words, the outer growth layer of 1939, which constitutes the 

 annual boundary, becomes thicker inward on the branch as well as 

 less decisive in its differentiation from enclosing growth layers. The 

 incomplete, entire growth layers of 1941 at 46 and 34 cm. are just as 



Table 114. — XSC 9-3 



60 cm. 53 cm. 



1938 2 see 2 dee 



1939 I see I see 



1 dee I dee 



I L I psce 

 (eonc. s+d) 



1940 2 see I see 



I msce 



I msL (long) I psL 



I see I sL 



1941 I see I see 



inc L's inc L's 



4/ cm. 

 I see 

 I dee 



I see 

 I dee 

 I psce 



I see 



I psce 



I dL (faint) 



I dL 



I see 

 inc L's 



57 cm. 

 I see 



I see 

 I dee 

 I dee 



1 see 



2 psce 



I d arc 

 ddw 



I dee 

 inc 



Table 115.— X5"C 9-4 

 57 cm. 46 cm. 



1938 I see I see 



I dee I dee 



I L I sL 



1939 2 see I see 



ddw I insce 



1940 3 see I see 



2 msce 



1941 



I msL 



I see 

 ine L 



I gl 



ddw 



34 cm. 

 I see (faint) 



I see 



1 dee 



I see 



I psce 



I dee 



ddw 



thick as at 57 cm., but the outer three to four rows of cells on each 

 are immature. There is no indication of densewood. 



XSC 9-5 (table 116) was frozen artificially at 42.5 cm. on May 9, 

 1941, and was cut off June 20, 1941. In the 1937 increment, the dif- 

 fuse, complete, entire growth layer at 48.5 cm. is fading rapidly. In 

 1938 a new diffuse, complete, entire growth layer appears at 42.5 cm., 

 but all of them at 33.5 cm. are faint or entirely gone. The outer sharp. 



