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Rh most striking evidence which shows our assumption to be wrong. In all intellectual and spiritual qualities, man, by the laws of evolution, may have greatly outdistanced his fellow animals; but it should never be forgotten that in judging of how far this has been the case, we—and there is no other court—are the most partial and prejudiced judges—dishonest, blinded, full of assumptions, delighting to deceive ourselves, and miserably vain.

If female birds are really so apathetic and male ones so equally satisfied with any partner they can get, it seems difficult to see on what principle the two, when paired, remain constant to one another during the nesting season, and still more, perhaps, why numbers of birds pair for life. Such a state of things ought, one would think, to lead to promiscuous intercourse. But if birds mate by preference and elective affinity, such constancy is what one might expect. What we want, however, to settle this and all other questions relating to the habits of animals is long, close, hard, exhaustive observation—real observation as distinct from mere writing, and even from good literature. There is wofully little of this, in my opinion, and none the less so because an impression exists that there is a great deal.