Indeed, among ourselves in Europe, have not the Irish preserved, under their foggy and cold sky, that southern nature which is revealed in their taste for certain arts, their small height, their black hair, the vivacity of the women, and the indolence of the men? Now, here is another order of facts,--man is not altered by emigration. Perhaps these facts are not very conclusive to all people, either on account of the difficulty of observation, or the short period which they embrace. They must be taken just as science offers them to us, and we must give our attention solely to reckoning the conclusion from the value of the premises. We now arrive at the second term of the law which we have laid down,--that man, transported to another country, eventually disappears. The theory which we thus form is of considerable importance. It has even received a particular name, it has been called the _Theory of the non-Cosmopolitanism of Man_. It is at the present day defended in France by Dr. Boudin, with as much energy as talent. In this matter, facts are abundant enough, and they at once take a considerable significance; and this is determined by figures, so that we must acknowledge that in most cases each race is by its nature attached to the ground which supports it, and that it is not with impunity that it oversteps its limits. It is because a foreign climate has in general a really destructive influence, producing degeneracy among emigrants, that is to say, a parallel morbid alteration of both the intellect and the body, that we always see the same races moving about in the same areas, and disappear when they pass them.[228] If the Semite, who has left Yemen, has come to pasture his camels near the shores of the ocean, opposite the Fortunate Islands, it is because he and his animals find in the Riff the same conditions of life that they did by the Nile and the Isthmus of Suez. Whatever has been said about the Jews and some other races, not one of them seems to be really cosmopolitan. To admit that a Jewish tribe, thrown into the midst of a black population, has become black by the sole action of the climate, is to admit that there were no conversions, no adoptions, and no sexual unions contrary to the law of Moses; and in this way the philosophic editors of the Code Napoléon, as well as daily medical practice, teach us what to think. For our part, we only see in these transformations of Jewish families, established far away, the result of the absorption of the type of a small group of emigrants by a population which outnumbers them. The Jew has disappeared; the language has been transmitted like the belief, and also the name.