stick or rod, the herdsman's staff; and from the waist downwards he must be of black stone of the colour of basanite, into which stone he was converted. Then in the rest of the great window you must paint the scene of the sacrifice that the ancients used to offer to Mercury to the end that their sleep might not be interrupted; and to represent this it is necessary to make an altar with his statue upon it, at the foot of that a fire, and all around persons who are throwing into it pieces of wood for burning, and who, having in their hands cups full of wine, are sprinkling part of the wine and drinking the rest. "In the centre of the oval, in order to fill up all the space of the heaven, I would paint Twilight, as being the mean between Aurora and Night. To represent him, I find that one must paint a young man wholly naked, sometimes with wings and sometimes without, and with two lighted torches, one of which we must show being kindled at that of Aurora, and the other held out towards Night. Some represent this young man, with the same two torches, as riding on one of the horses of the Sun or of Aurora, but this would not be a composition suitable for our purpose; wherefore we shall make him as described above, turned towards Night, and place behind him, between his legs, a great star, which shall be that of Venus, because Venus, Phosphorus, Hesperus, and Twilight seem to be regarded as one and the same thing. And with the exception of this star, see to it that all the lesser stars near the Aurora shall have disappeared.