Let us turn over our green-crusted penny. ‘COL. NEM.,’ [6] the reverse tells us. The inscription is accompanied by a Crocodile chained to a palm-tree from which hang crowns. It is an emblem of Egypt, conquered by the veterans who founded the colony. The beast typifying the Nile gnashes its teeth at the foot of the familiar tree. It speaks to us of Antony, the Don Juan; it tells us of Cleopatra, whose nose, had it been an inch shorter, would have changed the face of the globe. Thanks to the memories which it awakens, the scaly-backed reptile becomes a superb historical lesson. In this way, the important lessons of the numismatics of metals might be continued for many a day and be constantly varied without departing from my immediate neighbourhood. But there is another science of numismatics, far superior and less costly, which, with its medals, the fossils, tells us the history of life. I refer to the numismatics of stones. My very window-sill, the confidant of bygone ages, talks to me of a vanished world. It is, literally speaking, an ossuary, whose every particle retains the imprint of past lives. That block of stone has lived. Prickly spines of Sea-urchins, teeth and vertebræ of fish, broken pieces of shells and fragments of madrepores form a conglomeration of dead existences. Examined stone by stone, my house would resolve itself into a reliquary, a rag-fair of ancient things that were once alive. The rocky stratum from which we extract our building materials in these parts covers with its mighty shell the greater portion of the neighbouring uplands. Here the quarryman has been digging for none knows how many centuries, perhaps since the time when Agrippa hewed Cyclopean blocks to form the stages and the face of the theatre at Orange. And here daily the pick-axe uncovers curious fossils. The most remarkable of these are teeth, still wonderfully polished in the midst of their rough matrix and as bright with enamel as in the fresh state. Some of them are formidable, three-cornered, finely jagged at the edges, almost as large as a man’s hand. What a yawning gulf, a jaw armed with such a set of teeth in manifold rows, placed stepwise almost to the back of the gullet! What mouthfuls, snapped up and lacerated by those notched shears! You shiver at the mere thought of reconstructing that awful implement of destruction! The monster thus equipped as a prince of death belonged to the family of the Squali. Palæontology calls him Carcharodon megalodon. Our modern Shark, the terror of the seas, gives an approximate idea of him, in so far as a dwarf can give an idea of a giant.