l60 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I40 



In the increment of 1939 for TTP 24-15 (table 97) at ^-j cm., 

 narrow cells accompany arcs of compression wood, a combination 

 which occurs so often as to suggest a relationship. The divided 

 dense wood of 1942 at 52 cm. covers but a very short arc, whereas at 

 37 cm. it covers fully 180° of circuit. Tip growth of 1942 contains 

 two sets of bare-needle zones. 



Table gy.—TTP 24-15 



52 cm. 37 cm. 25 cm. TF 



1938 I see I see i 



1939 I see I see i 



1940 I see I see i see i 



I psce I dee idw 



1941 I see I see i see i 



1942 I see I see i see i 



2 dee 

 ddw ddw 



psg psg 



Table 98.— TTF 24-16 

 47 cm. 35 cm. 26.5 cm. 



1939 I see I see 



1940 I see I see i see 



I dee I dee 



idw idw 



1941 I see I see i see 



1942 I see 



I L 

 inc 



Table 99. — WCh 2-6 

 45.8 cm. 28.7 cm. TF 



1944 I see I see 2 



2 dee 



1945 I see I see i 



I dee 



The branch TTP 24-16 (table 98) was killed by artificial freezing 

 May 16, 1942. Isolated arcs of narrow cells typify 1940 and sug- 

 gest a rhythmic pattern. Compression wood commonly shows the 

 same rhythm. In 1942 at 35 cm., the lens was formed after artificial 

 freezing by a regenerated portion of the cambium. 



Branch WCh 2-6 (table 99) was cut from the tree June 17, 1945. 



