In like manner lived our half-human progenitors. But with them family parties no longer wandered aimlessly searching for food, but with a purpose. No longer forest dwellers, or vegetarians, food would require more zeal and discrimination in collecting, and shelter of some kind had probably to be devised, partly as a protection against predatory animals, and partly for personal comfort, since it would now have become apparent that this could be appreciably increased by the exercise of a little effort and ingenuity. This appreciation of creature comforts formed a cement holding the family together; a sense of safety in Society helped still further. Rude tools chipped from flints were among their earliest and most cherished possessions for the sake of the advantages they secured. Here was the earliest form of wealth and the birth of labour and a further step on the road to progress. Little would now occur to derange the harmonious routine of the daily life, save only the ever-present jealousy of the head of the family which was assailable both from within and without. His sons and daughters were probably now regarded as a portion of his wealth, for they ministered to his comfort, and aided in the daily work which had now become a necessity. As his sons attained to maturity, so they became rivals to be watched with a jealous eye, and finally driven off, while his daughters at the same time became potential mates. This danger of close inter-marriage was a real one, though it cannot be supposed that it was in any way realized. The risk was evaded by perfectly natural means. The jealousy of the head of the family which drove him to expel his sons as they attained maturity provided the means. These young bachelors sought their mates from neighbouring families, and it is probable that they would not be hard to lure from their parental control, but in such matters force was able to effect where persuasion failed. These mate hunting excursions are to be regarded as extremely powerful factors in securing the betterment of the race. They were adventures in which all must fail who did not possess courage, cunning, and brawn, for, paradoxical as it may seem, evolution depends, not so much on the qualities of the individual as on the elimination of the unfit. As yet might was right. But the strife of combat, fierce and merciless, had its beneficial results not only in weeding out the physically and mentally deficient, but in stimulating affection between the victor and his prize.