59), as well as in the chapels of Deir el Bahari, are of this type.

Besides the forms thus regularly evolved, there are others of irregular derivation, with six, twelve, fifteen, or twenty sides, or verging almost upon a perfect circle.

The portico pillars of the temple of Osiris at Abydos come last in the series; the drum is curved, but not round, the curve being interrupted at both extremities of the same diameter by a flat stripe.

More frequently the sides are slightly channelled; and sometimes, as at Kalabsheh, the flutings are divided into four groups of five each by four vertical flat stripes (fig.

60).