NO. I GROWTH LAYERS IN TREE BRANCHES — CLOCK ET AL. 



281 



Con T 1-13 (3d 1940-1942) 



a. 2 see + I dee — 3 tfs — 2J years, 



b. 2 gis — 2 tfs — 2 years. 



c. I gl — I tf — I year. 



i-ii 



1-14 



1-12 



io Soil 



Fig. 49. — Leader of Finns taeda (Con T 1-5) with branches, Con T i-ii to 

 1-19 and 1-21, to show annual increase in diameter flushes and tip flushes. Cross- 

 bars represent terminal bud scale scars. Capital letters refer to unstained blocks 

 removed from leader and branches ; small letters refer to position of stained 

 sections. Figures opposite letters give the number of growth layers in the sec- 

 tions represented by the letters. 



In sections a it is to be noted that the contact between 1941 and 1942 

 is weak and by no means as definite as the border of the intra-annual 

 in Con T i-14-a. 



