Next to reasoning, the greatest handicap to the optimum development of Man lies in the fact that this planet is just barely habitable. Its minimum temperatures are too low, and its maximum temperatures too high. Its day is not long enough, and its night is too long. The disposition of its water and earth is distinctly unfortunate (the existence of the Mediterranean Sea in the place where we find it is perhaps the unhappiest accident in the whole firmament). These factors encourage depression, fear, war, and lack of vitality. They describe a planet, which is by no means perfectly devised for the nurturing or for the perpetuation of a higher intelligence.