86 THE ZOOLOGIST, 



In pursuing an investigation of this kind, we would naturally 

 experiment with the domesticated animals first, and of such 

 animals those with which we are the most intimate. Thus the dog 

 and cat are household pets ; in many cases housemates from birth 

 to death. Generations of these animals are born within the social 

 atmosphere of the same human family, and quite likely derive or 

 receive through heredity, as well as by individual contact or expe- 

 rience, a feeling or sense of security, protection and fraternity. 



While such animals may be regarded perhaps as becoming, 

 through such contact, somewhat humanized, and therefore less 

 adapted or satisfactory for the purposes of such experiments, on 

 the other hand their familiarity with a great number of sounds 

 which their untrained brethren know nothing of would seem to 

 be fully an offset, and again their familiarity with man would 

 operate adversely to a feeling of fear when experimental sounds 

 were being made. 



We do not know that any influence analogous to music 

 inspires the Military Ants in their great marches, or that the 

 Monoecious Snails have any occasion for love-songs. But these 

 are not next of kin in the scale of Nature, and we have poor 

 relations nearer home who seem to be moved by the same or 

 similar impulses with ourselves. 



By voice or sounds fully as much as by facial expression or 

 gesture — movement of body or limb — the emotions are expressed 

 by the human animal, and this is in great measure the case 

 among the animals which follow along after or below man. The 

 moods and tenses of feeling, pleasure and pain, joys and sorrows, 

 are made apparent by the intonation of the voice, by the sounds 

 which such conditions induce, provoke or compel. 



We speak of the sense of hearing. An inquiry of the kind 

 herein suggested relates to the sense of sounds. 



The sense of sounds among the higher animals we may assume 

 to be nearly universal, and among dogs and some other animals, 

 combined with memory, tends to the development of the intel- 

 lectual quality, as the sense of hearing in a certain aspect is an 

 intellectual rather than a physical sense. 



To what degree this sense of sounds is developed or exists, can 

 be learned only by experiment, and requires on the part of the 

 experimenter what I unfortunately do not possess— a knowledge 

 of music, and the ability to play upon one or more instruments. 



