Wilhelm Bölsche describes all this in fitting words:[19] “In Africa,” he says, “a wonderful drama is to-day unfolding itself before our eyes. It is the downfall of the whole of a mighty animal world. What is being destroyed is the main remnant of the great mammalian development of the Tertiary period. Once it spread in the same fulness over Europe, Asia, and North America. Now in its last refuge this most wonderful wave of life is rapidly ebbing away. Everything contributes to this result--human progress, human folly, and even disease among the animals themselves.” [Illustration: SKETCH OF A HERD OF ELEPHANTS IN SOUTH AFRICA, BY HARRIS. IT GIVES AN IDEA OF THE ABUNDANCE OF ELEPHANTS IN THE CAPE DISTRICTS SIXTY YEARS AGO. THIS EXPLORER’S SKETCHES GIVE A TRUE PICTURE OF THE LANDSCAPE AS WELL AS OF THE ANIMALS.] To give an example: Through the trifling fact that we have ivory balls for billiards, the African elephant goes to destruction. The individual cannot stop this; but what he can do is to secure more material for each special branch of science before the door is closed, and to once more observe in their primeval surroundings the last elephants, wild buffaloes, giraffes--those last living vestiges of the Tertiary period. But above all, the sketches of Le Vaillant, a French explorer, who, about 1780, set out from Cape Town on his travels into the interior, are of great importance for our study of the former abundance of animal life in South Africa. They are all the more interesting for German readers because he traversed part of what is now German South-West Africa, and gives in his book an account of its condition at that time. He, too, tells of absolutely incredibly great multitudes of wild animals; on the banks of the Orange River he comes upon great herds of elephants and giraffes, and he cannot find enough to say of the astonishing wealth of animal life. For those who know German South-West Africa, his narrative is of special interest. He formed collections which he brought back with him to his native country, and to all appearance is a fairly trustworthy authority, though at the same time, like many contemporary and later travellers, here and there he makes assertions that are clearly unwarrantable. For instance, in one place he tells how he once rode a zebra, that he had wounded, for a considerable distance, back to his camp.