If the explanation I have offered should seem a true or highly probable one, it will, I feel sure, prove acceptable to many lovers of animals, who, regarding tins seemingly ruthless instinct, not as an aberration but as in some vague way advantageous to animals in their struggle for existence, are yet unable to think of it without pain and horror; indeed, I know those who refuse to think of it at all, who would gladly disbelieve it if they could. It should be a relief to them to be able to look on it no longer as something ugly and hateful, a blot on nature, but as an illusion, a mistake, an unconscious crime, so to speak, that has for its motive the noblest passion that animals know--that sublime courage and daring which they exhibit in defence of a distressed companion. This fiery spirit in animals, which makes them forget their own safety, moves our hearts by its close resemblance to one of the most highly-prized human virtues; just as we are moved to intellectual admiration by the wonderful migratory instinct in birds that simulates some of the highest achievements of the mind of man. And we know that this beautiful instinct is also liable to mistakes--that many travellers leave us annually never to return. Such a mistake was undoubtedly the cause of the late visitation of Pallas' sand-grouse: owing perhaps to some unusual atmospheric or dynamic condition, or to some change in the nervous system of the birds, they deviated widely from their usual route, to scatter in countless thousands over the whole of Europe and perish slowly in climates not suited to them; while others, overpassing the cold strange continent, sped on over colder, stranger seas, to drop at last like aerolites, quenching their lives in the waves. Whether because it is true, as Professor Freeman and some others will have it, that humanity is a purely modern virtue; or because the doctrine of Darwin, by showing that we are related to other forms of life, that our best feelings have their roots low down in the temper and instincts of the social species, has brought us nearer in spirit to the inferior animals, it is certain that our regard for them has grown, and is growing, and that new facts and fresh inferences that make us think more highly of them are increasingly welcome. CHAPTER XXIII. HORSE AND MAN.