It is usual on these occasions for the chair man to begin something like this: The lecturer, I am sure, needs no introduction from me. And indeed, when I have been the lecturer and somebody else has been the chairman, I have more than once suspected myself of being the better man of the two. Of course I hope I should always have the good manners — I am sure Mr. Leacock has — to disguise that sus picion. However, one has to go through these formalities, and I will therefore introduce the lecturer to you.