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gnaw through the muslin by which its mouth was closed. This on the seventh day they succeeded in doing, when they killed the imprisoned strangers. "The friends throughout were quite neglected," so that this experiment, as Sir John observes, seems to show that "in these curious insects hatred is a stronger passion than affection." This experiment always gave the same result in the case of this species; but, when tried with Formica rufescens, the ants took no notice of either bottle, and showed no signs either of affection or hatred; so that, as Sir John again observes, "one is almost tempted to surmise that the spirit of these ants is broken by slavery"—i. e., by the habit of keeping slaves.

But there is no lack of evidence to show, per contra, that the tenderer emotions have a place in ant-psychology. Even the hardhearted species which Sir John Lubbock observed grew sympathetic toward sick or injured friends. Thus he observed that a specimen of F. fusca, which was congenitally destitute of antennæ, and which had been attacked by an ant of another species, excited the sympathy of a friend on being placed near her own nest. This friend "examined the poor sufferer carefully, then picked her up tenderly, and carried her away into the nest. It would have been difficult for any one who witnessed this scene to have denied to this ant the possession of humane feelings." Again, Moggridge has seen one ant carry another sick and apparently dead ant "down the twig which formed their path to the surface of the water, and, after dipping it in for a minute, carry it laboriously up again, and lay it in the sun to dry and recover."

But some species of ants seem habitually to show affection and sympathy even toward healthy companions in distress. Thus Belt writes of the Eciton humata, that "one day watching a small column of these ants, I placed a little stone on one of them to secure it. The next that approached, as soon as it discovered its situation, ran backward in an agitated manner, and soon communicated the intelligence to the others. They rushed to the rescue," and by their concerted action effected the release of their companion. Similarly ants of this species which Belt buried were always dug out by their friends. To quote one such instance, the ant which first found the buried one

tried to pull her out, but could not. It immediately set off at a great rate, and I thought it had deserted her comrade, but it had only gone for assistance; for in a short time about a dozen ants came hurrying up, evidently fully informed of the circumstances of the case, for they made directly for their imprisoned comrade and set him free. I do not see how this could be instinctive. It was sympathetic help, such as men only among the higher mammalia show. The excitement and ardor with which they carried on their unflagging exertions for the rescue of their comrade could not have been greater if they had been human beings.

Ford and McCook have also observed displays of sympathy and affection by other species.