You bought me for five hundred drachmas, but what if it turns out that you are the greater fool of the two?" And thus the astute and witty Davus continues to ply his master with taunts and jeers and wise saws, till Horace, in fury, cries out, "Where can I find a stone?" Davus innocently asks, "What need is there here of such a thing as a stone?" "Where can I get some javelins?" roars Horace. Upon which Davus quietly remarks, "This man is either mad or making verses." Horace ends the colloquy by saying, "If you do not this instant take yourself off, I'll make a field-hand of you on my Sabine estate!" [Illustration: Roman Wall Caricature of a Christian.] That Roman satirists employed the pencil and the brush as well as the stylus, and employed them freely and constantly, we should have surmised if the fact had not been discovered. Most of the caricatures of passing events speedily perish in all countries, because the materials usually employed in them are perishable. To preserve so slight a thing as a chalk sketch on a wall for eighteen centuries, accident must lend a hand, as it has in the instance now given. This picture was found in 1857 upon the wall of a narrow Roman street, which was closed up and shut out from the light of day about A.D. 100, to facilitate an extension of the imperial palace. The wall when uncovered was found scratched all over with rude caricature drawings in the style of the specimen given. This one immediately arrested attention, and the part of the wall on which it was drawn was carefully removed to the Collegio Romano, in the museum of which it may now be inspected. The Greek words scrawled upon the picture may be translated thus: "Alexamenos is worshiping his god." These words sufficiently indicate that the picture was aimed at some member, to us unknown, of the despised sect of the Christians. It is the only allusion to Christianity which has yet been found upon the walls of the Italian cities; but it is extremely probable that the street artists found in the strange usages of the Christians a very frequent subject.