The most important exploring expedition that any one could undertake now, would be to cross Africa from east to west, keeping close to the first degree of north latitude, to ascertain the geological formation of that parallel. Within the coast-ranges, in consequence of the great elevation of the land, the temperature is always moderate, and it is proved to be much more healthy than any of those parts of Africa subjected to periodical seasons. Next to this scheme, I would recommend this fertile zone to be attacked from Gondokoro on the Nile, and from Gaboon (the French port) on the equator. The Gondokoro line, being known to a considerable extent, is ready for working, and only requires government protection to make it succeed; but the other line from the Gaboon should first be inspected by a scientific expedition.