Professor Ayer's lecture is not only a most auspicious inauguration; it is also an important contribution to philosophy. It is perhaps the best and the most exciting work he has written, and that is saying a good deal. There is a certain theory about thought and its objects which is often hinted at in the utterances and the writings of contemporary empiricist philosophers, but so far as I know it has never before been stated in print. Mr. Ayer has stated it, clearly and in detail, with all his well-known force and felicity of style. It is a strange and rather shocking theory, very different (in appearance at any rate) from the one which most philosophers hitherto have believed. But if we are shocked by it, the shock will be salutary. The dragon has at last come clearly into view. If we resolve to accustom ourselves to it and treat it kindly, we may hope that it will transform itself by degrees into a nice gentle domestic pet, as other philosophical dragons have before.