The Committee will be grateful to the right hon. Gentleman for enlightening us to that extent, but I think we would like a little more information as we want to make sure what the Government wish to get by this Clause. The mysterious phrase, "carrying on any art or manufacture," still remains a little obscure. The right hon. Gentleman mentioned the manufacture of citric acid, oxalic acid and penicillin. I should have thought that the matter might have been a little clearer if a Schedule had told us what is covered by this Clause. I do not know whether the list of articles which the right hon. Gentleman quoted was merely an example, or was comprehensive, but if there are others we should be glad to know what they are. Just how art comes into all this is a little mysterious.