Of the manner of the ordinary discourse there are many indications. It was given sometimes in a private house, sometimes in a theatre, sometimes in a regular lecture-room. The professor sometimes entered already robed in his “pulpit-gown,” and sometimes put it on in the presence of his audience. He mounted the steps to his professorial chair, and took his seat upon its ample cushion.[166] He sometimes began with a preface, sometimes he proceeded at once to his discourse. He often gave the choice of a subject to his audience.[167] He was ready to discourse on any theme; and it was part of his art either to force the choice of a subject, or so to turn the subject as to bring in something which he had already prepared. “His memory is incredible,” says Pliny of Isæus; “he repeats by heart what he appears to say extempore; but he does not falter even in a single word.”[168] “When your audience have chosen a subject for you,” says Lucian,[169] in effect, in his satirical advice to rhetoricians, “go straight at it and say without hesitation whatever words come to your tongue, never minding about the first point coming first and the second second: the great thing is to go right on and not have any pauses. If you have to talk at Athens about adultery, bring in the customs of the Hindoos and Persians: above all, have passages about Marathon and Cynægirus—that is indispensable. And Athos must always be turned into sea, and the Hellespont into dry land, and the sun must be darkened by the clouds of Median arrows ... and Salamis and Artemisium and Platæa, and so forth, must come in pretty frequently; and, above all, those little Attic words I told you about must blossom on the surface of your speech—ἅττα (_atta_) and δήπουθεν (_depouthen_)—must be sprinkled about freely, whether they are wanted or not: for they are pretty words, even when they do not mean anything.”