the disadvantages of such an animal to a more marked degree perhaps than any other. In physical matters he owes to his gregariousness and its uncontrolled tendency to the formation of crowded communities with enclosed dwellings, the seriousness of many of his worst diseases, such as tuberculosis, typhus, and plague; there is no evidence that these diseases effect anything but an absolutely indiscriminate destruction, killing the strong and the weakly, the socially useful and the socially useless, with equal readiness, so that they cannot be regarded as even of the least selective value to man. The only other animal which is well known to suffer seriously from disease as a direct consequence of its social habit is the honey bee—as has been demonstrated by recent epidemics of exterminating severity.
In mental affairs, as I have tried to show, man owes to the social habit his inveterate resistiveness to new ideas, his submission to tradition and precedent, and the very serious fact that governing power in his communities tends to pass into the hands of what I have called