232 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I40 



In the 1935 increment the dense wood of the middle growth layer 

 breaks apart into a 120° lens whose margins are sharp, especially 

 under high power. Under low power the nature of the lens causes 

 two-thirds of its inner margin to appear somewhat indefinite. Further 

 in connection with 1935, relative thicknesses do not remain the same 

 around the circuit because the middle growth layer is thicker than the 

 inner growth layer on one radius but considerably thinner than the 

 inner one on the opposite radius. 



The lightwood of outer 1936 disappears at two places around the 

 circuit so that for a distance of 70° two bands of densewood lie next 

 to each other. 



The sharp lens of 1937 lies between the 2 see and extends away 

 from the short radius for more than half the circuit. 



The outer see of 1938 is of considerable interest because over part 

 of the circuit its thickness is very slight and its densewood "thin" and 

 indefinite compared with the inner see. The densewood of the outer is 

 itself thin and all its characteristics are subdued. Elsewhere on the 

 circuit the contacts of the 2 see are of equal definiteness. If it were 

 not for the positions of the 1938 and 1939 natural frost injuries, the 

 outer margin of 1938 would not be placed at the outer edge of the 

 "thin" exterior growth layer — the "thin" growth layer would be in- 

 cluded within 1939. 



Branch TTC 12-12 (table 162) was cut off July 31, 1944. 



Table 162. — TTC 12-12 

 22.8 cm. 14.3 cm. 9 cm. 



1942 I see 



I dL 



1943 2 see 3 see i see (outer 19437 



I sL 



1944 2 see 2 see 2 see 



I sL 

 psg psg psg 



A summary of sections a (22.8 cm.) reads : 

 5 see + I dL + psg — 3 years. 



In sections a, the densewood of 1942 consists of two bands sepa- 

 rated for more than half the circuit by the insertion of one to two 

 rows of wider cells which yield the appearance of a rather indefinite 

 lens. Without certain dating, one would be unable to classify the lens 

 as a distinct growth layer or as an indefinite intra-annual. 



