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& junipers and make many corrections and addition to my zone map & color in the still nearer Canadian zone area of the San Mateos with considerable accuracy. This was the easier as the aspens have turned a golden yellow & their limits coencide with that of the spruces. The zone map of this region I now consider fairly accurate.

The San Mateos are one enormous old crater with the rim complete 2 thirds of the way around and inclosing a ^[[insertion]]beautiful[[/insertion]] secondary cone of 1000 feet in height. The rim of the old crater is probably 4 miles across, circular & of nearly uniform hight, the highest peak reaching 11385 feet as shown by the contour map. Both inner & outer slopes are well sodded over & covered with good timber or grass. There is comparatively little exposed rock until the lower canyons & mesa cliffs are reached some 4000 feet lower down, where the lava sheets break off and show