42	THE DIAMOND MINES OF SOUTH AFRICA
	mud-banks and the fogs, of the Sea of Darkness. If by any stretch of daring they might cross the equatorial line, they were
	burdened with the fear that they would begin to slide down an inclined plane with a rush that would pitch them headlong into
	some bottomless abyss. The only assurance of a happier issue was the bare tale of old Herodotus of some nameless Phoenician