170 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 14O 



XSC 9-3 (table 114) was frozen artificially May 9, 1941, at 47 cm., 

 and was cut ofif June 6, 1941. At 60 cm. the lens of 1939 is concurrent 

 with four members, half of them sharp, half diffuse; outward on the 

 branch the lens apparently becomes an entire growth layer. The in- 

 complete lenses of 1941 have the appearance of what has commonly 



been called postseasonal growth, a designation difficult to apply here 

 because of the early cutting date. 



XSC 9-4 (table 115) was frozen artificially at 46 cm. on May 9, 

 1941, and cut off June 14, 1941. At 57 cm. the outer sharp, complete, 

 entire growth layer of 1939 is very thin and possesses a thin, weak 

 band of densewood compared with that of the inner growth layer. At 

 46 cm. the inner growth layer has become indefinite over a portion of 

 its circuit, and the outer one is thinner. The inner growth layer has 

 become totally diffuse at 34 cm. and its densewood joins that of the 



