The wonderful flight of the velt-fowl, their calls and cries, their hurry and bustle, afforded me ever new interest. It always seemed to me as though the wide wilderness here sent out its lovingly guarded favourite children as envoys, with the mission of making it known that even now, in this dull, barren time, life has not died out even in the most remote deserts. So I see and hear them once more in fancy, beautiful, timid, and full of the joy of life. It is thus their countless millions enliven the wastes of Africa, as well as the endless tundra marshes of Asia. Deep, long-drawn-out notes, like those of musical glasses, ring in my ears. The brooding noonday heat is round me. The sun is in the zenith, and hardly another sound is to be heard all around. The wilderness lies before me in the hot glowing sunlight as if dead. My weary bearers have given themselves up to a dozing sleep, at the place where I have at last halted, after a march of many hours with a few companions. Before me is a miniature mountain-world lighted up by the dazzling sunbeams. There is a mass of precipitous rocks, so characteristic of the Masai-Nyíka district, that stretches away into the distance. The Candelabra Euphorbias spread out their strange forms against the light, in grotesque clumps, and seem to me to make themselves one with the rocks, whose inorganic character and nature appear to be repeated in their characteristic forms. From out of the midst of this stony wilderness these remarkable notes come sounding in my ears. They seem to be mysterious voices of rock and stone. The eye searching expectantly for the singer that is uttering this bell-like melodious music can discover nothing. And yet the notes come from the throat of a bird. It is once more some hornbills that are making their song of love and wooing resound in this wilderness. I have been able to listen to them for hours, losing myself in dreams, and I cannot say why I seemed to identify precisely _these_ bird-voices with the voice of the African Sphinx, that legendary Sphinx which has sung already to so many, and lured many back again for ever. Thus may the songs and voices of the old sanctuaries of Northern Africa once have been. Again and again, when I heard it, I had to think of those men who, with burning longing in their hearts, went forth into the Dark Continent to wrest from it the secrets of its fauna, but had to pay for the undertaking with their lives. A burning glow of sunshine, a dazzling light in overwhelming abundance over all the desert waste of rock--and amidst it, again and again, that deep, ghostly, metallic note, that directly impresses the traveller as though it were the language of the wilderness, peculiarly its own. But how can I describe all this in words?