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The first care of the male stickleback, when he has acquired his courting suit, is to build a suitable home for his future wives and children. So he picks up stems of grass and water-weeds with his mouth, and weaves them deftly into a compact nest as perfect as a bird's, though some what different in shape and pattern, it rather resembles a barrel, open at both ends, as though the bottom were knocked out: this form is rendered necessary because the eggs, when laid, have to be constantly aerated by passing a current of water through the nest as I shall describe hereafter. No. 1 shows us such a nest when completed, with the female stickleback loitering about undecided as to whether or not she shall plunge and enter it. You will observe that the fabric is woven round a fixed support of some waving water-weeds; but the cunning little architect does not trust in this matter to his textile skill alone; he cements the straws and other materials together with a gummy mortar of mucous threads secreted for the purpose by his internal organs.

There is reason to believe that after his reconciliation with the king of England Innocent III had all the letters in which he had threatened John with the severest penalties collected so far as possible and destroyed.[76] It is uncertain, however, whether before the end of 1212 he had gone so far as to depose the king and to absolve his subjects from their allegiance, though this is asserted by English chroniclers. But there is no good ground to doubt that in January, 1213, he took this step, and authorized the king of France to invade England and deprive John of his kingdom. Philip needed no urging. He collected a numerous fleet, we are told, of 1500 vessels, and a large army. In the first week of April he held a great council at Soissons, and the enterprise was determined on by the barons and bishops of France. At the same council arrangements were made to define the legal relations to France of the kingdom to be conquered, The king of England was to be Philip's son, Louis, who could advance some show of right through his wife, John's niece, Blanche of Castile but during his father's lifetime he was to make no pretension to any part of France, a provision which would leave the duchy of Aquitaine in Philip's hands, as Normandy was. Louis was to require an oath of his new subjects that they would undertake nothing against France, and he was to leave to his father the disposal of the person of John and of his private possessions. Of the relationship between the two countries when Louis should succeed to the crown of France, nothing was said. Preparations were so far advanced that it was expected that the army would embark before the end of May.

The Darwinian doctrine of evolution depends essentially on _the cumulative augmentation_ of minute variations in the direction of utility. But can such minute variations, which are undoubtedly continually appearing among the individuals of the same species, possess any selection-value; can they determine which individuals are to survive, and which are to succumb; can they be increased by natural selection till they attain to the highest development of a purposive variation? To many this seems so improbable that they have urged a theory of evolution by leaps from species to species. Koelliker, in 1872, compared the evolution of species with the processes which we can observe in the individual life in cases of alternation of generations. But a polyp only gives rise to a medusa because it has itself arisen from one, and there can be no question of a medusa ever having arisen suddenly and _de novo_ from a polyp-bud, if only because both forms are adapted in their structure as a whole, and in every detail to the conditions of their life. A sudden origin, in a natural way, of numerous adaptations is inconceivable. Even the degeneration of a medusoid from a free-swimming animal to a mere brood-sac (gonophore) is not sudden and saltatory, but occurs by imperceptible modifications throughout hundreds of years, as we can learn from the numerous stages of the process of degeneration persisting at the same time in different species.

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