The chronicle discovered by Captain Guillain justifies these conclusions by giving the history of the arab colonies from Quiloa to Sofala. It relates the wars which were raised for the possession of the gold mines; it shows the conquerors driving out the conquered, and compelling them to go southwards to seek a new country. It is evident that the latter have crossed Delagoa Bay, where they have left the black race in its state of original inferiority, and have gone further to ally themselves voluntarily or involuntarily with tribes whose type has thus risen. In fact, far from being a _species_, the Zulus are a _mixed race_ of Negroes and Arabs, whose formation is so recent that mediate heredity and atavism still betray the double origin, which is also attested by philology, but in which the negro element preserves a very great superiority. X. The investigation of mixed populations, the determination of the part played by each of the elements which have assisted in their formation, belong to the most interesting questions of anthropology. This study ought not to stop at populations in which the mixture of characters is evident at first sight. It ought also to bear upon those which are generally regarded as quite pure. We should then find that mixture of races has penetrated where it was scarcely suspected. In China and especially in Japan, the white allophylian blood is mixed with the yellow blood in different proportions; the white semitic blood has penetrated into the heart of Africa; the negro and houzouana types have mutually penetrated each other and produced all the Kaffir populations situated west of the Zulus of Arabian origin; the Malay races are the result of the amalgamation, in different proportions, of Whites, Yellows, and Blacks; the Malays proper, far from constituting a _species_, as polygenists consider them, are only one _population_, in which, under the influence of Islamism, these various elements have been more completely fused, etc. I have quoted at random the various preceding examples, to show how the most extreme types of mankind have contributed to form a certain number of races. Need I insist upon the mixtures which have been accomplished between the secondary types derived from the first? In Europe what population can pretend to purity of blood? The Basques themselves, who apparently ought to be well protected by their country, institutions, and language against the invasion of foreign blood, show upon certain points, in the heart of their mountains, the evident traces of the juxtaposition and fusion of very different races.