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This illustration is entirely apt, the only difference between the two cases consisting in the fact that the variation in the flower is not a useful, but a disadvantageous one, which can only be preserved by artificial selection on the part of the gardener, while the transformations that have taken place parallel with the sterility of the ants are useful, since they procure for the colony an advantage in the struggle for existence, and they are therefore preserved by natural selection. Even the sterility itself in this case is not disadvantageous, since the fertility of the true females has at the same time considerably increased. We may therefore regard the sterile forms of ants, which have gradually been adapted in several directions to varying functions, _as a certain proof_ that selection really takes place in the germ-cells of the fathers and mothers of the workers, and that _special complexes of primordia_ (_ids_) are present in the workers and in the males and females, and these complexes contain the primordia of the individual parts (_determinants_). But since all living entities vary, the determinants must also vary, now in a favourable, now in an unfavourable direction. If a female produces eggs, which contain favourably varying determinants in the worker-ids, then these eggs will give rise to workers modified in the favourable direction, and if this happens with many females, the colony concerned will contain a better kind of worker than other colonies.

It is of some interest that in all the contemporary discussion of this case no one ever suggested that John was personally incapable of such a violation of his oath or of such a murder with his own hand. He is of all kings the one for whose character no man, of his own age or later, has ever had a good word. Historians have been found to speak highly of his intellectual or military abilities, but words have been exhausted to describe the meanness of his moral nature and his utter depravity. Fully as wicked as William Rufus, the worst of his predecessors, he makes on the reader of contemporary narratives the impression of a man far less apt to be swept off his feet by passion, of a cooler and more deliberate, of a meaner and smaller, a less respectable or pardonable lover of vice and worker of crimes. The case of Arthur exhibits one of his deepest traits, his utter falsity, the impossibility of binding him, his readiness to betray any interest or any man or woman, whenever tempted to it. The judgment of history on John has been one of terrible severity, but the unanimous opinion of contemporaries and posterity is not likely to be wrong, and the failure of personal knowledge and of later study to find redeeming features assures us of their absence. As to the murder of Arthur, it was a useless crime even if judged from the point of view of a Borgian policy merely, one from which John had in any case little to gain and of which his chief enemy was sure to reap the greatest advantage.

The action of the acids and other solvents is described in the chapter on Reagents. ~Precipitation.~--In precipitating add sufficient of the reagent to complete the reaction. The student must be on his guard against adding a very large excess, which is the commoner error. In some reactions the finishing point is obvious enough; either no more precipitate is formed, or a precipitate is completely dissolved, or some well-marked colour or odour is developed or removed. In those cases in which there is no such indication, theoretical considerations should keep the use of reagents within reasonable limits. The solutions of the reagents (_see_ REAGENTS) are generally of five or ten per cent. strength. A small excess over that demanded by theory should be sufficient.

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