Animals as musicians, too, were often introduced,--pigs playing on viols, or pipes, an ass performing on the harp, and similar eccentricities may be found in numerous places, while Reynard the Fox in all his forms abounds. The choir stalls at Lincoln exhibit beautiful carving and design: they date from the fourteenth century, and were given by the treasurer, John de Welburne. There are many delightful miserere seats, many of the selections in this case being from the legend of Reynard the Fox. Abbot Islip of Westminster was a great personality, influencing his times and the place where his genius expressed itself. He was very constant and thorough in repairing and restoring at the Abbey, and under his direction much fine painting and illuminating were accomplished. The special periods of artistic activity in most of the cathedrals may be traced to the personal influence of some cultured ecclesiastic. A very beautiful specimen of English carving is the curious oak chest at York Cathedral, on which St. George fighting the dragon is well rendered. However, the termination of the story differs from that usually associated with this legend, for the lady leads off the subdued dragon in a leash, and the very abject crawl of the creature is depicted with much humour. Mediaeval ivory carving practically commenced with the fourth century; in speaking of the tools employed, it is safe to say that they corresponded to those used by sculptors in wood. It is generally believed by authorities that there was some method by which ivory could be taken from the whole rounded surface of the tusk, and then, by soaking, or other treatment, rendered sufficiently malleable to be bent out into a large flat sheet: for some of the large mediaeval ivories are much wider than the diameter of any known possible tusk. There are recipes in the early treatises which tell how to soften the ivory that it may be more easily sculptured: in the Mappae Clavicula, in the twelfth century, directions are given for preparing a bath in which to steep ivory, in order to make it soft. In the Sloane MS. occurs another recipe for the same purpose. Ahab's "ivory house which he made" must have been either covered with a very thin veneer, or else the ivory was used as inlay, which was often the case, in connection with ebony. Ezekiel alludes to this combination. Ivory and gold were used by the Greeks in their famous Chryselephantine statues, in which cases thin plates of ivory formed the face, hands, and exposed parts, the rest being overlaid with gold, This art originated with the brothers Dipoenus and Scillis, about 570 B. C., in Crete.