acquire a singular firmness and precision; the principal lines become deeper; details, such as the fur and mane, are indicated by lighter lines, and even the shading is expressed by delicate hatching. But what is nearly always apparent is a sense of truthful realisation, and the exact copying of characteristics which enable us often to recognise not only the order, but the precise species, which the artist wished to represent. The bear, engraved on a piece of schist which was found by M. Garrigou in the lower cave at Massat, with the characteristic projecting forehead, can be no other than the cave-bear, the bones of which were recovered by that observer in the same place. When we compare the drawings and anatomical details of the Siberian mammoth with the engraving on ivory discovered by M. Lartet at La Madeleine, it is impossible to avoid recognising the _Elephas primigenius_ which existed throughout the Glacial period, and which has been recovered entire in the frozen soil of Northern Asia. Oxen, wild goats, the stag, the antelope, the otter, the beaver, the horse, the aurochs, whales, certain species of fish, etc., have been found recognisable with the like certainty. The reindeer especially is frequently represented with remarkable skill. This may be seen by the engraving found near Thayingen, in Switzerland.”[94] M. de Quatrefages is disposed to estimate the artistic merit of the carvings in ivory as even greater than that of the drawings or etchings. But specific form and contour are more easily realisable than their indication on a plane surface. To do full justice to the wonderful skill of the Troglodyte draughtsman, we must compare the most highly-finished paintings on Egyptian temples and tombs with the works of their sculptors; or even the perfect realisations of the Greek sculptors’ chisel, with drawings on the most beautiful Hellenic vases. The mastery of perspective, as shown in some of the works of those palæolithic artists is remarkable when compared, for example, with the Assyrian bas-reliefs; not to speak of the infantile efforts of the Chinese on their otherwise justly prized ceramic ware.