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But I can find no such case. p. 189. Another of these assumptions is not a little remarkable. But another branch of the argument would be greatly strengthened by establishing the descent of our various breeds of dogs with their perfect power of fertile inter-breeding from different natural species.
Nor have we at present any reason to believe that man is highly sensitive to the evil effects of inter-breeding, especially in areas so large as New Zealand, and the Sandwich archipelago with its diversified stations.
We know that these qualities are easily affected by changed conditions of life, or by close inter-breeding, and that they are governed by highly complex laws, for instance, that of the unequal fertility of converse crosses between the same two species.
I would not, however, be taken to advocate the inter-breeding of white and black. Those who have witnessed the misery and suffering which the coloured people have to endure for being coloured will welcome any fair means of preventing miscegenation in South Africa.
I have often said that there is no true love short of eating and consequent assimilation; the embryonic processes are but a long course of eating and assimilation the sperm and germ cells, or the two elements that go to form the new animal, whatever they should be called, eat one another up, and then the mother assimilates them, more or less, through mutual inter-feeding and inter-breeding between her and them.
Some writers have suggested that the aborigines of islands have suffered in fertility and health from long continued inter-breeding; but in the above cases infertility has coincided too closely with the arrival of Europeans for us to admit this explanation.
It was a popular misconception of the theory of the Survival of the Fittest, a misconception Lord Salisbury was at great pains to display to the British Association in 1894, that the average of a species in any respect is raised by the selective inter-breeding of the individuals above the average.
Audouin believes that the females of this species are impregnated by the males which are born in the same cells with them; but it is much more probable that the females visit other cells, so that close inter-breeding is thus avoided. The female, on the other hand, with the rarest exceptions, is less eager than the male.
The King Charles variety used to consist of black and tan and black and white Spaniels, and it is thought that by the inter-breeding of the two specimens the Tricolour was produced. The colour of the King Charles now is a glossy black with rich mahogany tan spots over the eyes and on the cheeks. There should also be some tan on the legs and under the tail.
But how plasticity is related to race we do not yet know. It may be that use-inheritance somehow incorporates its effects in the offspring of the plastic parents. Or it may be simply that plasticity increases with inter-breeding on a wider basis. These problems have still to be solved.
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