If this conclusion requires confirmation, the facts quoted by Prosper Lucas will be sufficient. He treats of unions between Negroes and Whites accomplished in Europe. In the same family we find the black blood predominate at first, then lose its influence, and by degrees become effaced almost entirely in the children of the later generations. In one of these observations, the mother belonged to the black race; so that infidelity was unable to effect any change in the conditions of the experiment. It was then the conditions of life which gradually blanched these half-breeds, who would all have been black upon the borders of Senegal. VI. Some anthropologists, although recognising the multiplicity and fertility of the crossings between human races, only see in this fact a _confusion of blood_, and complain that nowhere do they find a mixed race of recent origin which is well characterised. Consequently they deny that the crossing can have any influence in the formation of the races with mixed but constant characters which form part of the population of the globe. This objection rests upon a disregard of the phenomena which accompany the formation of animal races by the production of mongrels. All breeders know well that a determinate and settled race cannot at once be produced by crossing. In such a case, the conflict and the compromises, of which I have spoken above, become more marked, for the very reason that we have to blend two natures which are dissimilar in some respects. _Immediate_ and _direct heredity_ alone continually produces phenomena of _fusion_ or of _juxtaposition_, or else causes the appearance of new features, the _resultant_ of two different characters. _Mediate_ and _indirect heredity_, as well as _atavism_, continually intervene and produce numerous irregularities in the succeeding generations. The more the races differ and are _equal in respect to blood_, the more marked and persistent are these irregularities. In 1800 the Ancon race still gave irregular products. For more than twenty years M. Malingié has failed in settling his charmois race, so that it might itself serve for fresh crossings.