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There is a curly retriever at Arundel bearing the name of "Shock," which sets an example of good manners and intelligence to the animals which are not dumb. He carries the cat of the stables tenderly in his mouth, and would carry the kitten, but at present the kitten prefers its own means of locomotion. When Sanger's elephant got into trouble in the river Arun, this wise Shock was sent to turn him out, and his perseverance succeeded. He often will insist on carrying a bundle of umbrellas to the station, and safely he delivers them to their owners, and then, with many wags of his brown tail, he demands a halfpenny for his trouble. This halfpenny he carries to the nearest shop, lays it on the counter, and receives his biscuit in return. Need we say this dog has a kind, sensible master?

The fact of coadaptation, which was supposed to furnish the strongest argument against the principle of selection, in reality yields the clearest evidence in favour of it. We _must_ assume it, _because no other possibility of explanation is open to us, and because these adaptations actually exist, that is to say, have really taken place_. With this conviction I attempted, as far back as 1894, when the idea of germinal selection had not yet occurred to me, to make "harmonious adaptation" (coadaptation) more easily intelligible in some way or other, and so I was led to the idea, which was subsequently expounded in detail by Baldwin, and Lloyd Morgan, and also by Osborn, and Gulick as _Organic Selection_. It seemed to me that it was not necessary that all the germinal variations required for secondary variations should have occurred _simultaneously_, since, for instance, in the case of the stag, the bones, muscles, sinews, and nerves would be incited by the increasing heaviness of the antlers to greater activity in _the individual life_, and so would be strengthened. The antlers can only have increased in size by very slow degrees, so that the muscles and bones may have been able to keep pace with their growth in the individual life, until the requisite germinal variations presented themselves. In this way a disharmony between the increasing weight of the antlers and the parts which support and move them would be avoided, since time would be given for the appropriate germinal variations to occur, and so to set agoing the _hereditary_ variation of the muscles, sinews and bones.[42]

At first these scales were scattered over the surface of the wing, but gradually they concentrated themselves, and formed broad, velvety bands, or strong, prominent brushes, and they attained their highest pitch of evolution when they became enclosed within pits or folds of the skin, which could be opened to let the delicious fragrance stream forth suddenly towards the female. Thus in this case also we see that characters, the original use of which was to bring the sexes together, and so to maintain the species, have been evolved in the males into means for exciting the female. And we can hardly doubt, that the females are most readily enticed to yield to the butterfly that sends out the strongest fragrance,--that is to say, that excites them to the highest degree. It is a pity that our organs of smell are not fine enough to examine the fragrance of male Lepidoptera in general, and to compare it with other perfumes which attract these insects.[43] As far as we can perceive them they resemble the fragrance of flowers, but there are Lepidoptera whose scent suggests musk. A smell of musk is also given off by several plants: it is a sexual excitant in the musk-deer, the musk-sheep, and the crocodile.

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