NO. I GROWTH LAYERS IN TREE BRANCHES — CLOCK ET AL. 245 



XSC 6-2-a (1933-1939) 

 8 see + I gl + 12 sL + 5 dL + I ct — 7 years. 



Sections XSC 6-2-a came from 117 cm. inward from the tip. 



XSC 6-3-a (1933-1940) 



7 see + 2 msce -|- i dee -|- 8 sL -j- i msL -f 4 s ^L + 5 ddw -}- 2 ct — 8 years. 



Both years, 1938 and 1939, are represented chiefly by i msce each. 

 In the 1939 increment, much of the dense wood is an irregular 

 "stringer," a single cell thick, which lies one to two cells out from the 

 1938 densewood. The multiple densewood of 1938, added to the poor 

 definition and development of 1939, creates an uncertainty which 

 would be fatal were it not for the frosts which date the growth layer. 



XSC 8-i-a (1936-1940) 



6 see -}- 2 msce -1- i gl -1- 4 sL + i ddw — 5 years. 



Sections of XSC 8-1 -a show 10 sharp growth layers on certain radii 

 and 12 on others. 



XSC 8-3-a (1937-1940) 



4 see -1- I msce -|-isL-t-idL-f-2s arcs + 3 d arcs -|- i ddw — 4 years. 



Different radii on sections of branch XSC 8-3 show many different 

 sequences because of the many sharp or partly sharp growth layers. 



XSC 8-4-a (1937-1940) 



5 see -f 2 msce -\- i psce -f3sL-l-idL-]-i s arc — 4 years. (See table 112, 

 p. 170.) 



The variety of growth layers in XSC 8-4 gives many different ra- 

 dial counts. Sections a at 66.5 cm., sections h at 50 cm., and sections c 

 at 37 cm. possess identical sequences save for 1939 of c which has 2 

 see instead of i, as in a and b. 



XSC 9-2-a (1938- 19 40) 

 3 see -|- I msce + 2 psee + 3 dee -f i sL + i msL — 3 years. 



XSC 9-3-a (193S-1941) 



7 see 4- 1 dee -|- i sL -|- i msL -|- i dL -|- ine L's — 3^ years. (See table 114, 

 p. 171.) 



Branch XSC 9-3 was cut off June 6, 1941, after having been frozen 

 artificially on May 9, 1941. The increment for 1941 contains i see 

 -Fine L's. 



