NO. l8 



TREE GROWTH AND RAINFALL CLOCK 



31 



Table 16.— Correlation of Holman Pass trees and Chacon rainfall 



Trend coefficients and ratios of opposed trends 



1909-1941 



March-July 

 0.92 



HPC I 



(0.25) 



0.89 

 (0.25) 



0.92 

 (0.19) 



0.89 

 (0.25) 



0.81 

 (0.34) 



0.78 

 (0.31) 



0.90 

 (0.22) 



0.88 

 (0.22) 



0.51 

 (0.28) 



January-August 



0.90 

 (0.31) 



0.90 

 (0.25) 



0.92 

 (0.12) 



0.83 

 (0.2s) 



0.68 

 (0.41) 



0.77 

 (0.31) 



0.87 

 (0.34) 



0.90 

 (0.22) 



0.62 

 (0.34) 



Holman Pass Tree Growth and Chacon Precipitation 



Percent Per Cent 



Group 4 



Precipitation 

 March-tIuly 



Precipitation 

 March-July 



Group 



1910 ^0^ 30 i^'*^ 



Fig 4 —Graphs of tree growth and rainfall 7 miles distant, in raw percentages. 

 Group 4, east of Pass ; group S, on Pass ; group 9, west of Pass ; group 10, nor- 

 mal or dry-site trees: group 11, wet-site trees; and group 7, all trees. 



