The use of the potter's wheel probably now begins, and the clay is carefully sifted and fired, the favourite colour scheme being white on lustrous brown or black slip, though sometimes the alternative scheme of dark upon light is adopted; and vases are sometimes fashioned out of very thin clay, in anticipation of the fine egg-shell Kamares ware of Middle Minoan II. The chief decorative motive is a horizontal band, or more than one, around the upper part of the vase. On these bands the chief ornament is the zig-zag, and curves directly derived therefrom, and the spiral begins to appear as a form of decoration. It is uncertain whether the credit for the origination of this favourite form of decorative motive is to be attributed to Egypt or to Crete. Miss Hall[*] regards the Early Minoan III. spirals as late-comers in the field, attributing the first development of the spiral to the painters of Egyptian pre-Dynastic vases; but Mr. H. R. Hall[**] denies the right of the volutes on the pre-Dynastic vases to be regarded as spirals at all, considers that the true spiral appears suddenly in Egypt as 'a new and unprecedented thing' about the beginning of the Middle Kingdom, and infers that in its use the Cretans were original, and the Egyptians merely borrowers; while Dr. Evans[***] denies originality to both, and holds that the use of the spiral was first developed on the European side of the AEgean. [Footnote *: 'The Decorative Art of Crete in the Bronze Age,' p. 9.] [Footnote **: Proceedings of the Society of Biblical Archaeology, vol. xxxi., part 5, pp. 221, 222.] [Footnote ***: 'Scripta Minoa,' p. 126.] The fact that the seals of this period show motives derived from the Egyptian Sixth Dynasty 'button-seals' suggests that Early Minoan III. is to be equated with the end of the Old Kingdom in Egypt. This, however, is but a slight help as to the positive date of the Minoan period, owing to the huge gap between the different systems of Egyptian chronology. All that can be said is that on Petrie's system of dating the Minoan period which is contemporary with the end of the Sixth Dynasty would date about 4000 B.C., and on the Berlin system about 2475 B.C. Though the two cultures are contemporaneous, it is, of course, by no means to be inferred that the art of Early Minoan III. has left us any relics which are worthy of being placed on a level with the wonderful work of the Egyptian Old Kingdom artists. The primitive pictographs on the bead-seals of this period mark the beginnings of this form of Minoan script, which persisted until Late Minoan I., when it was at last superseded by the linear form of writing which had made its appearance in Middle Minoan III.