Note 27 — Chapter I · STRUCTURE AND FUNCTIONS.

Since the foregoing remarks were written relative to the undefined use of tusks to the elephant, I have seen a speculation on the same subject in Dr. Holland’s “Constitution of the Animal Creation, as expressed in structural appendages;” but the conjecture of the author leaves the problem scarcely less obscure than before. Struck with the mere supplemental presence of the tusks, the absence of all apparent use serving to distinguish them from the essential organs of the creature, Dr. Holland concludes that their production is a process incident, but not ancillary, to other important ends, especially connected with the vital functions of the trunk and the marvellous motive powers inherent to it; his conjecture is, that they are “a species of safety valve of the animal œconomy,”—and that “they owe their development to the predominance of the senses of touch and smell, conjointly with the muscular motions of which the exercise of these is accompanied.” “Had there been no proboscis,” he thinks, “there would have been no supplementary appendages,—the former creates the latter.” (Pp. 246, 271.)