modes of response and their emotions are suggestions of peculiarly interesting problems as well as of modes of attacking them.  As a matter of fact, Skirrl’s fear-reactions did much to alter my conception of the constitution of his mind.  I should not have been surprised by the features of behavior exhibited, but I was by no means prepared for their persistence, and for the highly emotional attitude toward the particular situation.  Only an organism of complexly constituted nervous system and fairly highly developed affective life could be expected to respond as did this monkey.  As has been suggested above, I find the appeal to instinct, modified by experience, a natural mode of accounting for the unexpected features of Skirrl’s behavior.

Sympathy

The instinctive playfulness of the young monkey Tiny contrasted most strikingly with the more serious, if not more sedate, modes of behavior of the older individuals.

During the greater part of my period of observation Tiny was cage-mate of Scotty, the most calm and apparently lazy of all the monkeys.  Tiny delighted in teasing Scotty, and her varied modes of mildly tormenting him and of stirring him to pursuit or to retaliation were as interesting as they were amusing.  Her most common trick was to steal up behind him and pull the hair of his back, or seize his tail with her hands or teeth.  Often when he was asleep she would suddenly run to him, give a sudden jerk at a handful of hairs, and leap away.  He was surprisingly patient, and I never saw him treat her roughly in retaliation.

Another of Tiny’s favorite forms of amusement was that of trying to stir up the other monkeys to attacks on one another.  She very cleverly did this by pretending that she herself was being attacked.  The instant the older animals began to show hostility toward one another she would leap out of the way and watch the disturbance with evident satisfaction.  It was this mode of behavior in the little animal which ultimately provided opportunity for the observations which I wish now to report as indicative of sympathetic, possibly I may say altruistic, emotions.

Tiny was confined with Scotty in a cage adjoining the one in which Jimmie and Gertie were being kept.  The cages were separated by wire netting of half-inch mesh.

One morning as I was watching the behavior of the animals in the several cages, I noticed Tiny dressing with her teeth a wounded finger.  It had evidently been bitten by one of the other animals, in all probability either by Jimmie or Gertie.  Tiny was trimming away the loose bits of skin very neatly and cleansing the wound.  After working at this task for a few minutes, she quickly climbed up to the shelf near the top of her cage, and by rushing to the partition wire between the two cages, she lured Gertie to an attempted attack on her.  Gertie sprang up to the partition, placed her hands on it, with the fingers projecting through the meshes, and attempted to seize Tiny’s