140 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I40 



Tree TTC 36 (tables 65, 66), insofar as the sample branches are 

 concerned, does not show quite the consistency of the previously de- 

 scribed trees. Multiplicity and sharpness of boundary tend to increase 

 slightly, inward on the branches. 



Table 66.— TTC 36-4 

 50 cm. 38 cm. 26.5 cm. 



1940 I see 2 see 



I sL 



1941 I see I see i see 



ddw I psee 



1942 I see I see i see 



I msce I psee i psce 



Branch TTJ i-i (table 6y) was cut off January 11, 1940. In 1937 

 the intra-annual becomes sharper outward, whereas the densewood 

 of the annual becomes less sharp. The increment for /pj/ is so com- 

 monly multiple in the Lubbock region that it can be used as a diag- 

 nostic dating feature. Growth-layer sequence changes decidedly along 

 the length of the branch. At 24 cm., in 1939, thin cells occur inter- 



