A communication from M. Trémaux, an Abyssinian traveler, has been presented to the French Academy by M. Geoffroy St. Hilaire: it gives an account of the sudden difference which occurs in the races of men and animals near Fa Zoglo, in the vicinity of the Blue Nile. The shores of this stream are inhabited by a race of Caucasian origin, whose sheep have woolly coats; but at a few miles' distance, in the mountains of Zaby and Akaro, negro tribes are found whose sheep are hairy. According to M. Trévaux, 'the differences and changes are due to two causes: the one, that vegetable nature, having changed in aspect and production, attracts and supports certain species, while others no longer appear, or the individuals are fewer. As for the second cause, it is the more surprising, since it produces opposite effects on the same point: where man has no longer silken, but woolly hair, there the sheep ceases to be covered with wool.' M. St. Hilaire remarked on these facts, that the degree of domestication of animals is proportional to the degree of civilization of those who possess them. Among savage people dogs are nearly all alike, and not far removed from the wolf or jackal; while among civilized races there is an almost endless variety--the greater part far removed from the primitive type. Are we to infer from this that negroes will cease to be negroes by dint of civilization--that wool will give place to hair, and _vice versâ_? If so, a wide field is opened for experiment and observation. MONTHLY RECORD OF CURRENT EVENTS.