NO. I GROWTH LAYERS IN TREE BRANCHES — CLOCK ET AL. 24I 



the second tf ; and at 7.5 from the third tf . Hence, the i psce cor- 

 responds to the first two tfs and the i see to the third tf. 



Table 171. — WPe 1-5 



5.5 cm. 22.5 cm. TF 



1944 I see I see i 



I psce 

 1945 inc (p) ine (p) I 



Branch WPe 1-5 (table 171) was cut off June 17, 1945. It had 

 grown a "first flush" of 11 cm. after which its original tip had died. 

 Sections at 8.5 cm. were taken 8.5 cm. inward from the dead tip. The 

 "second" tip flush was a branch coming off the first tip flush 3 cm. 

 back from the dead tip — it began growth after the original tip had 

 died. Tip growth for 1945 was a linear addition to second 1944. Sec- 

 tions at 22.5 cm. came from 4 cm. outward in second 1944 — the lateral 

 branch. The i psce corresponds to the first tip flush, the one with the 

 dead tip ; the i see corresponds to the second tip flush, the lateral 

 branch. Hence, nonlinear tip flushes, as well as linear, can have diam- 

 eter flushes corresponding to them. The growth layer for 1945 was 

 nearly, if not quite, complete. 



Table 172.— WPe 1-6 



24 cm. 19 cm. 37 cm. TF 



1943 I see 



I psce 



1944 I see I see i see 



I psce I psee 



194S inc inc inc 



Branch WPe 1-6 (table 172) was cut off June 17, 1945, after a tip 

 growth of 14.5 cm. which was a linear continuation of the second 1944 

 tip flush. The second 1943 tip flush of 2 cm. was a direct linear con- 

 tinuation of the first 1943 tip flush ; sections at 24 cm. came from 3 

 cm. inward from the outer end of first 1943. The first 1944 tip flush 

 was a linear continuation of 1943, retaining a length of 19 cm. after 

 its tip had died ; sections at 19 cm. came from a very slight distance 

 out from the start of first 1944. Second 1944 tip growth came out as 

 a lateral (or nonlinear) branch back from the dead tip and attained a 

 length of 24.5 cm. ; sections at 37 cm. came from 2 cm. out from the 

 base of the second 1944 tip flush. Hence, 1943 with two "linear" tip 

 flushes contains a growth layer for each, and 1944 with two "non- 



