in a mood of anxious, earnest entreaty, which contained no sound of anger, warning, or alarm, but, on the contrary, appeared to be a kind of love-speech. I had not learned the exact meaning of any one of the sounds contained in this cylinder, but in a collective and general way had ascribed such meaning to them. From Puck’s conduct it was to be inferred that this was some kind of complaint against those monkeys occupying the other cage. They had made life a burden to little Pedro. It was evident that Puck interpreted the actions of the monkey seen in the glass to mean one thing, and the sounds that came from the horn to mean quite another. Their language is not capable of relating narratives or giving details in a complaint, but in general terms of grievance it may have conveyed to Puck the idea of a monkey in distress, and hence his desire to avoid it. The image in the glass presented to him a picture of a monkey in a happy mood, and he therefore had no cause to shun it. The speech used by monkeys is not of a high order, but it appears to have been developed from an inferior type. Some species among them have much more copious and expressive forms of speech than others. From many experiments with the phonograph I conclude that some have much higher phonetic types than others. I have found slight inflections that seem to modify the values of their sounds. Certain monkeys do not make certain inflections at all, although in other respects the phonation of a species is generally uniform. In some cases it appears that the inflections differ slightly in the same species, but long and constant association tends in some degree to unify these dialects much the same as like causes blend and unify the dialects of human speech. I observed one instance in which a Capuchin had acquired two sounds which strictly belonged to the tongue of the white-faced Cebus. At first I suspected that these sounds were common to the speech of both varieties; but on inquiry it was found that this brown Cebus had been confined for some years in a cage with the white-face, during which time he had acquired them. The most interesting case that I have to record is one in which a young white-faced Cebus acquired the Capuchin sound for food. This occurred under my own observation, and, being attended by such conditions as to show that the monkey had a motive in learning the sound, I regard it as most noteworthy.