"The season of love is the season of battle," says Darwin. To those who understand love there will be no cause of surprise in these procreative explosions. There can be no doubt that such combats are a stimulus to mutual sexual excitement in the males who take part in them and the female who watches them. Throughout Nature love only reaches its goal after tremendous expenditure of energy. Courtship is the prelude to love. The question is--what form it shall take? It is this that even yet we have not decided. But the importance of courtship cannot be overlooked. We must regard it as the servant of the Life-force. In the fine saying of Professor Lloyd Morgan,[52] "the purpose of courtship reveals itself as the strong and steady bending of the bow, that the arrow may find its mark in a biological end of the highest importance in the survival of a healthy and vigorous race." Even the most timid animals will fight desperately under the stimulus of sex-passion. Hares and moles battle to the death in some cases; squirrels and beavers wound each other severely. Seals grapple with tooth and claw; bulls, deer and stallions have violent encounters, and goats use their curved horns with deadly effect.[53] The elephant, pacific by nature, assumes a terrible fury in the rutting season. Thus, the Sanskrit poems frequently use the simile of the elephant goaded by love to express the highest degree of strength, nobility, grandeur and even beauty.[54] It is hardly necessary to point out that in these love-conflicts we may find the sources of our own brute passions of jealousy, and the origin of duels, murders and all the violent crimes committed by men under the excitement of sexual emotion--the tares among the wheat of love that drive men mad and wild. In birds it is among the gallinaceae that love incites the male with warlike fury. The barn-door cock is the type of the jealous male--amorous, vain and courageous.[55] It must be noted that wheresoever supremacy in love is obtained by force the male has necessarily become, through the action of selection, stronger and better armed than the female. Among birds, where the law of battle largely gives place to a gentler wooing, there are many species in which the female is larger and stronger than the male, and a much greater number where there is no appreciable difference between the sexes. These prove what we have already established among the invertebrates, that there is no necessary correlation between weakness and the female sex. But to this question, so important in its bearing on the relative position of the sexes, I shall return later.