The symmetrically placed hypothetical islands in the great continuousocean disappeared, and the oekumene acquired a new form by the representation of the Indian Ocean as a larger Mediterranean completely cut off by land from the Atlantic. The terra incognita uniting Africa and Farther Asia was an unfortunate hypothesis which helped to retard exploration.
Long., an extent of half a million square miles, still remained a blank in the map. But the two expeditions of 1873, conducted by William Christie Gosse (1842-1881), afterwards deputy surveyorgeneral for South Australia, and Colonel (then Major) Egerton Warburton, made a beginning in the exploration of this terra incognita west of the central telegraph route.
Murphy, Terra incognita (1873); and F.