134 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I40 



already been detailed to some extent. This display may now be ex- 

 tended and amplified. The abbreviations given on page loi are per- 

 tinent to the present detail. Here, also, the figures in centimeters 

 measure the distance of the cross sections from the respective grow- 

 ing tips and, it is to be noted, the dates given have been established 

 with certainty. 



In the tables which follow (tables 52-141), the vertical succession 

 of growth layers under any one year of a particular section has no 

 relation to the sequence of growth layers in the annual increment. The 

 sharpest and the best-developed growth layers (i.e., see's) are in- 

 variably placed first. Each individual growth layer, however, is fol- 

 lowed outward on the branch by the horizontal direction in the tables. 

 Cutting dates are mentioned where they are of direct importance to 

 the development of the last annual increment. 



Table 52. — TTAp j-4 

 60 cm. 54 cm. 25 cm. 5 cm. TF 



1938 I see I see 2 



2 dee 



1939 I see I see i see i see i 



I s arc I s arc 



1940 inc inc inc inc I 



Sections were cut from branch TTAp 1-4 (table 52) April 21, 

 1940. The growth for 1940 thickens outward on the branch. Two 

 points should be made: First, four tip flushes (TF) at a minimum 

 represent three growing seasons, one of which is incomplete; and 

 second, certain radii at 60 and 54 cm. possess three sharp contacts for 

 two years whereas other radii have but two contacts for two years. 

 In the remainder of the illustrations, similar and additional facts can 

 be ascertained among radial variations, sectional variations, and the 

 relation between tip flushes and diameter flushes. 



Table 53. — TTAp 2-4 

 47 cm. 42 cm. 20.5 cm. 5.4 cm. TF 



1938 I see I see 2 



I msec 



1939 I see I see 2 see 2 see i 



I sL I sL 



I L ddw ddw 



The increment for 1938, TTAp 2-4 (table 53), insofar as it is 

 present at 47 cm., has one growth layer sharp around the entire circuit 



