. Carnegie Institution of Washington publication. METHOD OF ESTIMATING RAINFALL BY GROWTH OF TREES. 107 trees out of thi-ee which were tested from the Santa Rita Mountains in southeastern Ari- zona, 200 miles from Prescott, were found to have rings which could readily be identified in terms of the Prescott series. 1880 1890 1900 1910. Group I Trees 1-10 Group II Trees 11-35 Group III Trees 36-50 Group IV Trees 51-60 MeHn of all trees 1-60 1870 1880 1890 1900 1910 Fio. 9.—Annual Growth of Trees at Prescott, Arizona. YEARLY IDENTIFICATION. Let us now return to the application of the process of c
. Carnegie Institution of Washington publication. METHOD OF ESTIMATING RAINFALL BY GROWTH OF TREES. 107 trees out of thi-ee which were tested from the Santa Rita Mountains in southeastern Ari- zona, 200 miles from Prescott, were found to have rings which could readily be identified in terms of the Prescott series. 1880 1890 1900 1910. Group I Trees 1-10 Group II Trees 11-35 Group III Trees 36-50 Group IV Trees 51-60 MeHn of all trees 1-60 1870 1880 1890 1900 1910 Fio. 9.—Annual Growth of Trees at Prescott, Arizona. YEARLY IDENTIFICATION. Let us now return to the application of the process of cross-identification to the trees at Prescott. PreUminary to the enumeration of the rings, a particularly clean section was selected and its rings were numbered consecutively; then all the other sections were com- pared with this as a standard. On the completion of 67 sections a careful review was made, and only three cases were found still to be questionable. At that time the following notes were made, the numbers being those obtained by counting back from the outer ring, that is, the ring of 1910: " No. 6 frequently double, mostly single, probably really 1 year. Nos. 31 and 32, mostly 1, occasionally clearly 2 years, still in doubt. Nos. 53 and 54 occasionally clearly separate, sometimes very close, often completely merged in one, still in ; Upon further examination the following occurrences were noted: No. 6 was found double or triple in 46 cases and single in 21, but still uncertain. Nos. 31 and 32 were found. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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