The whites were set down at one million, or about one fifth of the whole population, at the most prosperous period of the vice-kingdom. I doubt if they now amount to half or even a quarter of that number, and of this population there is a very vigorous French immigration, now amounting to five or six thousand, and about as many Germans, a handful of English, and still less Americans. The native white population does not possess the physical energy requisite for rapid increase. They form no portion of the laboring people; they live in effeminacy, and their children are not nursed at the healthy breasts of athletic negresses, as are the children of our Southern planters, but are suckled by a more enervated race than themselves, viz., the Meztizos. The emigration from Spain was never an emigration of laboring men. It consisted almost entirely of priests, stewards, clerks, and taskmasters, to whom labor was considered as degrading. When the Spaniards lost a monopoly of these employments, and sank to the level of the native races, their numbers rapidly declined. The slight foreign immigration above mentioned is not one of laborers, for labor is considered an unbecoming employment at Mexico for white men, but an immigration of tradesmen and shop-keepers, who add nothing to the material wealth of the country. Of the Mexican Negro race I never knew but two, and one of them held the post of captain in the army, and the other was the naked alcalde, mentioned in a former chapter, who was discharging the functions of "Judge of First Instance." The reasons assigned for the disappearance of this race from Mexico after so large an importation of slaves as that which took place in the last century is the incongeniality of the climate of Mexico, particularly of the table-lands, to the negro constitution. At the breaking out of the Mexican revolution, almost the only negro slaves in the country were in the department of Vera Cruz. The sugar-planters of the hot country of the interior, finding it impossible to carry on their estates by the use of negro slaves, attempted to reduce the mortality among their working people by raising up a race of those disgusting-looking beings called Zambos, a cross of negroes and Indians; but it was attended with the usual ill success that has followed every attempt to cross or intermingle different and distinct races of men, animals, or even plants. INTERMIXTURE OF RACES.