176) the river flows along the line next the floor, boats come and go, and boatmen fall to blows with punting poles and gaffs.

In the division next above, we see the river bank and the adjoining flats, where a party of slaves, hidden in the long grasses, trap and catch birds.

Higher still, boat-making, rope-making, and fish-curing are going on.

Finally, in the highest register of all, next the ceiling, are depicted the barren hills and undulating plains of the desert, where greyhounds chase the gazelle, and hunters trammel big game with the lasso.

Each longitudinal section corresponds, in fact, with a plane of the landscape; but the artist, instead of placing his planes in perspective, has treated them separately, and placed them one above the other.