South Carolina, comprised between 32° and 35° N. lat., is situated beyond the zone where the African Negroes live: New Orleans, Mobile, and Pensacola are situated nearer the tropics, between the 30° and 31°, and we find in Africa, in Northern Sahara, south of Algiers, some tribes of Negroes who have lived in that latitude from time immemorial. Though the climate does not altogether depend on latitude, it may be readily believed that the Negroes become sooner acclimated upon the shores of the Gulf of Mexico than in the more northern regions. But it is known that men transplanted into climates differing much from that in which their race thrives may, by this simple fact, greatly lose their fecundity. It is not always so, but considering that it does happen, we have a right to ask whether the difference pointed out by Dr. Nott between the Mulattoes of South Carolina, and those of the region of the Gulf may not be owing to this cause. This interpretation is, however, in opposition to two orders of facts. On the one hand, the Negroes and Negresses of South Carolina are perfectly prolific between themselves.[28] The climate of that country has not weakened their generative powers, and there is no reason why, by their alliances with a white race acclimated in that part, there should he produced an offspring less acclimated than their parents. The diminished vitality and fecundity can, therefore, not be attributed to the influence of the media in which they are brought up. On the other hand, a result similar to that mentioned by Nott, as regards South Carolina, seems to have been obtained in Jamaica under the 18°, corresponding nearly to the latitude of Senegal and Timbuctoo. This island is situated south of Cuba, Hayti, and Porto Rico, where Negroes and Mulattoes thrive, but these islands have been colonised by the French and the Spaniards, whilst Jamaica is an _English_ colony.[29] The Mulattoes of Jamaica have thus the same ethnologic origin as those of Carolina; and the following remarks from the _History of Jamaica_, by Long, entirely confirm Nott’s opinion.[30] “The Mulattoes of Jamaica,” says Long, “are generally well proportioned, and the Mulatto women have fine features, and seem to have more of the White than of the Negro in their blood. Some of them have married women of their own colour, but these marriages are generally sterile. They seem in this respect to resemble certain mules, being less capable of producing between themselves than with the Whites or Blacks. Some instances may possibly have occurred, where, upon the intermarriage of two Mulattoes, the woman has borne children, which children have grown to maturity; _but I never heard of such an instance_.