stubbly beard, shiny black clothes, and gold-headed cane earned him an amused glance and nothing more. Malone did not know him by sight till duty called him to the case, but had heard of him indirectly as a really profound authority on mediaeval superstition, and had once idly meant to look up an out-of-print pamphlet of his on the Kabbalah and the Faustus legend, which a friend had quoted from memory.