Preface.I have been called upon to write illustrative sketches to a series of engravings, designed by an eminent artist. In performing my part of the work I have thrown the Mammalia into twenty-four groups—corresponding more or less to the picture designs—and have dwelt chiefly on the geographical distribution of the animals. The Cetaceae and Vespertilionidae are properly omitted.In the groups given there is no attempt made at any very scientific arrangement. The sketches are purely of a popular character, even the scientific nomenclature being avoided. It is hoped, however, that they may prove of service to the zoological tyro, and form as it were his first stepping-stone to a higher order of classification.In reality, notwithstanding the prodigious speculations of learned anatomists, no truly good arrangement of the Mammalia has yet been arrived at; the deficiency arising from the fact that, as yet, no true zoologist has had the opportunity of a sufficiently extended observation of the natural habits of animals.Now, however, that the great agent—steam—has as it were “brought the ends of the earth together,” the opportunity is no longer wanting; and it is to be hoped that a better classification may soon be obtained. Who knows but that some ardent young zoologist, who has taken his first lessons from this little book, may be the man to supply the desideratum? Who knows?Such a result would be a proud triumph for the author of these monographic sketches.Mayne Reid.