Plate 7 



Fig. I. TTC i-ii-d. Portion of same branch section as in figure 2, plate 6, but 

 on nearly opposite radius. Xylem of 19.13-1945. Dating by natural frost 

 effects. Compare with figure 2, plate 6, for variations around circuit, with 

 figure 2, plate 5, and figure i, plate 6, and figure i, plate 5, for variations 

 along branch. Lensing in opposite directions in successive annual increments ; 

 weak annual dw. 

 1943 : see with weak dw. 

 1944: Natural frost spots; lenses opening to left; see, but at right, outer dw 



of increment is weak and i cell thick. 

 1945: Natural frost circle; lens opening to right; see with irregular outer 

 margin. 



Fig. 2. TTC 3-10-a. Branch section of Ciiprcssiis ari::oiiica. cut February i, 

 1 941. Parts of 1939 and 1940 increments. Lens under high power showing 

 lenticular lightwood and continuous densewood. 



