330 Table J. — Errors of Ring Counting in northern Arizona Pines. 



The ininua sign indicates that the tree made no ring in thia particular year. A plus sign indicates an extra ring. D after the d.-ite 

 signifies that in the straightraway count tliis ring was noticed, but was considered a double, and hence was reckoned with one of the 

 adjacent years. The brackets mean that the ring was actually measured but still considered a double belonging with its neighbor. 



[Table compiled by A. E. Douglass.] 



