Professor Lyall gave a tiny smile. "Come on, then, to bed with us, and I will remind you, in the best possible way, how young you really are." "Very good, sir." "Ah, Biffy, I rather think that now that is my line." Biffy laughed and straightened his spine, grabbing the Beta by the hand. " Right`o, come along, then." "Very good, Sir." Professor Lyall managed, somehow, to make his reply sound lika a change in rank, a promise of wickedness, and the approval of a favorite teacher, all in one simple phrase.