Professor Forbes informs us that in a moderate-sized Urchin there are sixty-two rows of pores in each of the ten avenues, and as there are three pairs of pores in each row, the total number of pores is 3,720; but as each sucker occupies a pair of pores, the number of suckers is 1,860. He says, also, that there are above three hundred plates of one kind, and nearly as many of another, all dovetailing together with the greatest nicety and regularity, bearing on their surfaces above 4,000 spines, each spine perfect in itself, and of a complicated structure, and having a free movement in its socket. "Truly," he adds, "the skill of the Great Architect of Nature is not less displayed in the construction of a Sea-urchin than in the building up of a world!"
IVORY SCEPTRE OF LOUIS XII.
The above engraving represents an ivory sceptre, or Main de Justice, which was made at the early part of the sixteenth century for Louis XII., King of France. The three parts 1, 2, 3, screw together and form the sceptre. Fig. 4 is the hand on the top of the sceptre, given on a larger scale, showing the ring set with a small pearl, worn on the third finger. Fig. 5 is the inscription on the sceptre; it is engraved in relievo upon three of the convex decorations, and commences on the lowest one.
TOMB OF CÆCILIA METELLA.
