Though I have been a member of this Institute, I think from its foundation, I have been a steadily inactive member, and have resisted with what grace I could the blandishments of our Secretary when he has suggested that I should address my fellow-members. For I am not a philosopher, either by training or, I fear, by instinct; and, now that I have allowed myself to be inveigled into this place, I feel that I am brawling in church. I am the most ill-informed of laymen, and, if you feel any interest at all in what I am about to say, it will, I fear, only be the rueful interest that the expert sometimes takes in an exhibition of ignorance.