. Biology in America. Biology. 176 Biology in America the transition zone inclndo tlio mountain "lion" or puma, whit'h extends liis j)ro\vIin<j: patli fi-oin I'atagonia to (-anada, the Canada lynx, a skunk, the raeeoon, hadger and one of the deer. Viee versa Canadian mammals extending across the transition zone southward into the Sonoran include the chip- munks, l)eaver. meadow mouse (Microtus) and the Grove of Aspens Overflowed by a Beaver Pond WiUi the ( and stumps cut by beaver in the foreyrouud. Original. Below the yellow pine forest on San Francisco IMountain
. Biology in America. Biology. 176 Biology in America the transition zone inclndo tlio mountain "lion" or puma, whit'h extends liis j)ro\vIin<j: patli fi-oin I'atagonia to (-anada, the Canada lynx, a skunk, the raeeoon, hadger and one of the deer. Viee versa Canadian mammals extending across the transition zone southward into the Sonoran include the chip- munks, l)eaver. meadow mouse (Microtus) and the Grove of Aspens Overflowed by a Beaver Pond WiUi the ( and stumps cut by beaver in the foreyrouud. Original. Below the yellow pine forest on San Francisco IMountain we reach the icgion of pinon pines and red cedars which ex- tends between 6,000 and 7,000 feet, while below this we leave the mountain and enter the desert. Both of these latter areas belong to the southern or Sonoran life area in North America, so named from the province of Sonora in ^Mexico, which is at or near the center from which its characteristic. 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 Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
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