We must be blinded by prejudice not to comprehend that these same general facts, revealed by the study of biology and animal psychology, are repeated in the human mind. Some animals are even superior to the majority of men in the intensity of their sentiments of sympathy and duty, as well as in love and conjugal fidelity--monkeys and parrots, for example. In the social insects, such as the ants and bees, with their communities so solidly organized and so finely coördinated on the basis of instinct, the sentiment of social duty has almost entirely replaced the individual sentiments of sympathy. An ant or a bee only loves, so to speak, the whole assemblage of his companions. It does not sacrifice itself for any one of them in particular, but only for the community. In these animals the individual is only regarded as a number in the community whose motto is--one for all, but never all for one. In bees especially, the degree of sympathy extended to a member or a class of the hive is exactly proportional to the utility of this member to the community. The working bees will kill themselves or die of hunger in order to nourish their queen, while in the autumn they ruthlessly massacre all the males or drones which have become useless. =Sentiments of Patriotism and Humanity.=--The human brain, so powerful and so complicated, contains a little of all these things, with enormous individual variations. In man, the sentiments of sympathy and duty relate especially to the family, that is to say, they are to a great extent limited to individuals interested in a sexual community, viz., the conjoints and children, as occurs generally in mammals. It follows that sentiments of sympathy connected with larger communities such as remote relatives, the clan, the community, the country, those who speak the same language, etc., are relatively much weaker, and result from education and custom rather than from instinct. The weakest sentiment is certainly that of _humanity_, which regards each man as a brother and companion, and from which is evolved the general sentiment of solidarity or social duty. How can it be otherwise in a species which has lived for thousands or perhaps millions of years as small hostile tribes, separated from each other? Primitive men were so destitute of all humanitarian sentiment that they not only killed one another and practiced mutual slavery, but also martyred, tortured and even devoured one another. In spite of all this, and as the result of custom and life in common, the individual sentiments of sympathy in man are easily extended to members of other races, especially as regards different sexes, so much so that enemies conquered and taken prisoners often became later on, owing to life in common, the friends or mates of their conquerors.