190 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I40 



Sections a, TTP 24-13, 52.9 cm. from base of terminal bud, in 1937 

 tip growth, contain i see for 1941 and i see plus ddw for 1942. Sec- 

 tions b, 41.4 cm. from base of terminal bud, in 1938 tip growth, con- 

 tain I see for 1941 and i see plus a diffuse lens for 1942. Sections c, 

 29.9 cm. from base of terminal bud, in 1939 tip flush, contain i see 

 for 1 94 1 and i see plus concurrent lenses for 1942. In sections a and b, 

 postseasonal growth exists rather plentifully whereas in c there is 

 none. 



As in TTP 24-12, 1941 of TTP 24-13 shows one growth layer for 

 two sets of bare-needle zones, and 1942 shows two growth layers for 

 two sets. 



Sections a of TTP 24-24, 14.9 cm. from base of terminal bud, in 

 inner needle zone of 1941, contain i see each for 1941 and 1942. Al- 

 though 1942 tip growth was to that of 1941 as 9.1 is to 7.8, the growth 

 layer for 1942 is much thinner than that for 1941, an inverse relation. 

 Sections b, 9.5 em. from base of terminal bud, in outer needle zone of 



1941 ; sections c, 6.3 em. from base of terminal bud, in inner needle 

 zone of 1942 ; and sections d, 0.3 cm, from base of terminal bud, in 

 outer needle zone of 1942 — each shows i see per year. Two sets of 

 bare-needle zones in tip growth are recorded as single flushes in diam- 

 eter growth, Postseasonal growth which is absent 29.9 em. from base 

 of terminal bud (sections c of TTP 24-13) and apparently still absent 

 at 14.9 em. from base of terminal bud (sections a of TTP 24-24) is 

 present outward on the branch from 9.5 em. to the base of the ter- 

 minal bud (sections b and c of TTP 24-24), 



TTP 24-15 comprised the inner and TTP 24-25 the outer part of 

 a single branch cut January i, 1943. The inner set of bare-needle 

 zones of 1941 measured 6.5 cm., and the outer measured 3 cm. For 



1942 tip growth the measurements were respectively y.y cm. and 2.8 

 cm., with a i.8-cm. terminal bud. Terminal bud scale sears separated 

 the annual flushes ; two branches came out at the base of 1941, one at 

 the base of the outer bare zone of 1941 and one between 1941 and 

 1942 ; and one bud grew at the base of the outer bare zone of 1942. 

 In 1942, only 0.5 cm. of tip growth occurred after May 16. 



Sections a, TTP 24-15, 52 em. from base of terminal bud, in the 

 1937 tip flush, contain i see for 1941 and i see plus slight ddw for 

 1942; sections b, 2,7 em, from base of terminal bud and in the 1938 

 tip flush, contain i see for 1941 and i see plus extensive ddw plus psg 

 for 1942; and sections c, 25 em, from base of terminal bud and in 

 the 1940 tip flush, contain i see for 1941 and i see plus 2 dee plus 

 psg for 1942, 



In TTP 24-25, most sections contain more than i see per year for 



