CYCLOGRAM ANALYSIS 



23 



carry over from one tree, to another better in such rings than in the thick ones. 

 Wet years probably lead to more conservation of water and food than dry 

 years. This aids the tree, but the amount of aid is greatly influenced by 

 topography about the tree, and so trees show some differences in growth. 



30 



25 



20 



««- 



10 



■2 5 

 0) 



or 



f • f 



# / 1 



_______ J- I ■ .J 



/ • \ 



d / \ 



— — — — / ^» m — 



• >% ^ ^ 



f 1 I J I I I I I I 



0.5 



1.0 



1.5 



2.0 



Fig. 10 — d. Frequency distribution: standardized ring widths in sensitive 

 records, Central Pueblo area. Mean group curve (73 trees). 



30 



25 



20 



>> 



o 



c 



0) 



3 15 



Cr 



<u 



C 



> 



10 



a) 5 

 01 



0.2 



0.4 



0.6 



0.8 



.0 1.2 1.4 1.6 1.8 2.0 



Fig. 10 — Frequency distribution: ring widths in datable though 

 not sensitive tree records. 



e. Susanville, Calif., 1813-1931 (coll. by E. Antevs). 



f. Central Washington, 1813-1931 (coll. by I. Bowman). 



2.2 



Dry years, however, reduce this source of differences between the trees and in 

 Arizona become excellent points of agreement. 



So the deficient rings from different trees may readily be compared in the 

 field by this plot that skeletonizes the facts about a sequence. This plot 

 merely requires a count outward from the central part and a note of the 



