NO. I GROWTH LAYERS IN TREE BRANCHES — CLOCK ET AL. 2I3 



from the tree; branch XSC 13-2 was cut 13 days after freezing; and 

 13-3, 27 days after. Thus, the amount of growth as well as the com- 

 pleteness of the growth layers depended upon the length of the period 

 of recovery. 



The year 1937 for XSP i (table 154) has two branches with unity; 

 1938, two multiple; 1939, two with unity; and 1940, two multiple. 

 There are eight branch-years of which four are single and four mul- 

 tiple. Agreement is zero. 



Table 150. — XSC 2 

 2-1 2-2 2-3 



1936 a. I see + 7 sL a. 5 see 4- 3 sL 



-|- I msL 

 b. I see -4- 7 sL b. 5 see + 3 sL 



+ ^ ""^^ a. 2 sL -f 6 msce 



e. 5 sce + 4 sL ^ 2 sL -[- 6 msce 



1937 a. 3 see -f- 2 sL a. 2 see -f i dee c. 2 sL -}- 6 msce 



b. 3 see + 2 sL b. 2 see + i dee 



c. 2 see + I dee 



1938 a. I see a. i see + 2 sL a. i see -|- i sL 



+ ares -|- ddw 



b. I see b. i see + i sL b. i see + i sL 



-f I dL + ddw 



c. I see + I sL e. i see + i sL 



-|- ddw 



1939 a. I see + 2 sL a. i see + i sL a. i see + i sL 



+ ddw 

 b. I see + 2 sL b. i see + i sL b. i see 4- 1 sL 



+ I msL -|- ddw 



e. I see + i sL c. i see + i sL 



+ I msL -}- ddw 



The year 1936 for XSP 2 (table 155) has one branch with unity 

 and two with multiplicity ; 1937, two with unity and one with mul- 

 tiplicity; 1938, all three multiple; and 1939, one with unity and two 

 with multiplicity. There are 12 branch-years of which 4 have unity 

 and 8 have multiplicity, giving an agreement of 33 percent. 



In the above detailed examples, agreement among the branches of 

 each tree varies from zero to 100 percent. A tabular summary of the 

 trees and branches used in the foregoing examples is given in table 

 156. 



Rather than extend table 156 to include all trees and all branches, 

 table 157 has been prepared to include the entire mass of data as a 

 percentage summary. 



