Of this Mr. Lemmon, who has recently been exploring in Arizona, says:

" Among the remarkable varieties there is time to mention only one pine. In 1S75 Dr. Roth-rock, of the Wheeler survey, discovered on the Santa Rita mountains a pine tree having a strong resemblance to the common yellow pine of California (Pinus ponderosa), but having its leaves in fascicles of five each, instead of three each, the number in the typical species. Coupling this character with others, derived from the smallness of the cone, etc, Rothrock judged the two to be distinct, and gave it the name of Pinus Arizonica, though admitting that his 'data was very meager' Last autumn Dr. Engelmann himself, with Prof. Sargent, visited the Santa Ritas, and both became satisfied that the pine was indeed distinct, and entitled to be ranked as a new species. Now, in the large inclosed forest of the Santa Catalina mountains, we find pine trees of the appearance and description given for the Pinus Arizonica. including the long, slender leaves in bundles of five; but unfortunately for the fate of the new species, some of the leaves are in fascicles of all numbers from two to seven.

On examination of this forest for several days, every variety of character distinguishing this polymorphous species was noted; the same as in the Sierra of California, with the added fea-tures of many-leaved fascicles and very small cones; so we are compelled to believe that the so-called Pinus Arizonica is only a form, or rather a sport of the Pinus ponderosa, so variable in its forms in California as to have received there four or five names from the lumbermen, but all specifically connected by intermediate forms. Of course, we must not deny that the Pinus Arizonica may exist in the Santa Rita mountains, a range some fifty miles southward of the Santa Catalina; but certainly the presumption is against it, and the facts presented, we think, show the wonderful transformation powers of isolation and climatic conditions to which this species has been subjected for ages, almost rendering it a distinct species. Fascicles of these pine leaves of different numbers and various lengths have been sent, accompanied by the gist of the above notes to Dr. Engelmann, Prof. Sargent, Dr. Parry and to the California Academy of Sciences, from whom we may expect decisive reports."