NO. I GROWTH LAYERS IN TREE BRANCHES — CLOCK ET AL. I37 



right from 43.5 cm. outward. At 48.5 cm., 5 cm. inward from the 

 freezing apparatus, the cambium suffered some injury; nevertheless, 

 weak densewood was formed. Substantial growth had been made 

 over the whole branch by May 18 and, from 43.5 cm. outward, the 



Table 5S-—TTC 33-9 

 49.3 cm. 34.5 cm. 24 cm. 



1940 I see I see 



I sL I msce 



I dL 



1941 I see I see i see 



1942 I see 



3 sL 



Table 56.— TTC 34-^ 

 48.5 cm. 43.5 cm. 



1939 I see I see 



I sL I sL 



1940 I see I see 



I sL I sL 



1941 I see inc inc inc 



Table S7'—TTC 34-4 



62 cm. 57 cm. 50 cm. 38.5 cm. 



1937 I msee i msee i see 



I sL I sL 



1938 I see I see i see i see 



I psee I psee 

 I sL I sL 



1939 I see I see i see i see 



I sL I sL I sL 



1940 I see I see i see i see 



I sL I sL I sL I sL 



I dL I dL 



1941 I see inc inc inc 



psg (?) 



one-quarter of the growth-layer thickness which was immature at the 

 time of freezing remained so until the branch was cut off Novem- 

 ber 29, 1941. 



Again, in TTC 34-4 (table 57), the formation of xylem was nearly 



