From time immemorial a remarkable accumulation of bones in the province of Teruel, Spain, has attracted attention. It is especially conspicuous in the low range of hills near Concud, and the people of that village seem to have generally regarded it as marking an ancient battlefield. So long ago as 1754 Torrubia briefly described this deposit in his Spanish Natural History; but his curiosity seems to have been aroused not so much by the bones themselves as by the crystalline calcite found occupying many of their cavities. Twenty years later an Englishman, William Bowles, again referred to the same bone-bed, and described it as containing the remains of men and women mingled with the bones of horses, donkeys, oxen, and smaller domestic animals. He also observed that the limestone above the bone-bed was filled with land and fresh-water shells. Cuvier quoted Bowles' description in his treatise on fossil bones, and after an examination of some teeth and bone-fragments collected by Proust at Concud, he was inclined to believe that these fossils really represented domestic animals as already determined, though he found no associated evidence of man.