“Those Mulattoes of Jamaica, of which I speak, have married young, have received some education, and are distinguished by their chaste and regular conduct. The observations made regarding them have a great degree of certainty. They do not breed, though there is nothing to indicate that they would not be prolific by intermarrying either with the Blacks or Whites. “In searching for facts contrary to this opinion, it is requisite to discard the suspicion that the Mulatress has had intercourse with any other man than her Mulatto husband, and there would still remain the question, whether the son of a Mulatto, married to the daughter of two other Mulattoes, is capable of producing and forming a durable race.” Such a grave fact could not be allowed to pass unchallenged. Professor Waitz, much embarrassed by it, could only oppose to it a passage extracted from a work published in 1845 by Lewis, _On the Negroes in the West Indies_. “Lewis,” says Waitz (_Anthropologie der Naturvölker_), “expressly denies the sterility of the Mulattoes of Jamaica in their marriages between themselves, and observes, that they are as prolific as the Blacks and Whites, but that they are for the most part flabby and weak, and their children have little vitality.” Long said he knew of no instance where the children of Mulattoes arrived at maturity. To refute this assertion, known instances should have been cited. But Lewis neglects doing so.[31] He says, on the contrary, that the children, from similar marriages, possess little vitality. Though this expression does not necessarily imply the impossibility of arriving at adult age, it tends at least to the conclusion that the children have little chance to reach it; and when we consider that the preceding passage was intended to refute Long’s assertions, it is surprising how little satisfies Professor Waitz. At any rate, it proves that he could find no other positive document in opposition to the fact mentioned by Long.