midnight
With the right cue he could recite instantly : `` An important application of this principle , with obvious reference to Heracleitos , occurs in Aristotle , who says -- '' He could do this with the notes anywhere . I am sure you appreciate Oscar and his great power of acquiring facts . So he was ready , like the wise virgins of parable . Bertie and Billy did not put one in mind of virgins : although they had burned considerable midnight oil , it had not been to throw light upon Philosophy 4 . In them the mere word Heracleitos had raised a chill no later than yesterday , -- the chill of the unknown . They had not attended the lectures on the `` Greek bucks . '' Indeed , profiting by their privilege of voluntary recitations , they had dropped in but seldom on Philosophy 4 .