244 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I40 



Branch XSC 2-2 was cut off May 26, 1940. Here, 25 sharp growth 

 layers represent 6-phis years. Various radii give different combina- 

 tions of sharp and diffuse growth layers. 



Sections b, ly cm. outward from a, give: 



18 see + I dee + 6 sL + 2 msL + i dL + inc — 6* years. 



The see are identical with those in a; i msL and the dL are dif- 

 ferent ; three of the sL are different ; and the dee are the same. 

 Sections c, 12 cm. outward from h, give : 



19 see + I dee -f 9 sL + i msL -f- inc — 6* years. 



The see and the i dee are most closely identical in a, b, and c; 3 sL 

 are new in c over 6 or 4 sL over a; and the i msL is totally different. 



XSC 2-s-a {1934-1940) 



3 see -}- 12 msce -|- 5 sL -f- i psL -}- 2 ddw— 6* years. (See table 106, p. 

 166.) 



Branch XSC 2-3 was cut off April 11, 1940. The years 1934 to 

 1937 are represented by 12 msce + 2 sL+ i psL. Even though parts of 

 the circuits are diffuse, the msce are, nevertheless, annual boundaries. 



XSC 4-i-a {^932-1939) 

 14 see -f- I dee + 12 sL -f- i msL -f i dL -f 2 arcs + i ct -{- 2 ddw — 8 years. 



The branch XSC 4-1 has 26 sharp growth layers, and one mostly 

 sharp, for eight years. 



XSC 6-i-a {.1933-1940) 

 12 see + 10 sL -}- I msL + 3 dL -)- 2 ddw + inc — 7* years. 



Branch XSC 6-1 was cut off Alay 10, 1940, and sections a were 

 taken 118 cm. from the tip. The complexity of 1935 in both sections a 

 and b is particularly confusing because the densewood of the outer 

 growth layer of the year is weak and "thin." It consists of one to two 

 cell-rows. But this annual margin is no better, in some cases worse, 

 than the outer margins of the intra-annuals of 1935 which we have 

 called "stringers." In addition, the increment contains a thick growth 

 layer with heavy densewood succeeded by a thin growth layer with 

 "thin," weak densewood. This situation of an "outer thin" growth 

 layer has, heretofore, commonly appeared as the outer border of an 

 annual increment. In 1935 of XSC 6-1, it is simply another intra- 

 annual. 



