28 FEBRUARY 1874, Page 12

AFRICAN GEOGRAPHY.

[To THE EDITOR OF TUE "SPECTATOR."] Sin, —Your correspondent, Mr. B. G. Jenkins, states that " within the historical period the southern part of what we now know as Northern Africa was washed by the ocean, which eventually receded, leaving its mark in that waste, the Sahara," &c. May I ask at what time within the historical period he supposes this to have occurred, and upon what evidence or authority ? For special reasons, the subject is peculiarly interesting to me, and I am anxious for the fullest information thereupon.—I am, Sir, &c.,

S. D. C.