"The Central Office deals with utilitarian knowledge and is separated into Controls. I, for instance, am at the head of the Heat and Light Control. The Outer Office deals with academical knowledge, and our friend is the Professor of Old-World History. The Inner Office decides questions of justice. But there is no time just now to explain our simple constitution to you. We should be starting for the Professor's house." "One more point," I said. "May I ask your name? I should have done so before." "We do not have names. Beings of the first class have a distinguishing formula, and only use names for plants and the lower animals. The second-class beings, the workers, may possibly use names among themselves, but of that I have no knowledge. My own distinguishing formula is MZ04, and as no two people have the same formula, much confusion is prevented. By the way, your hair is untidy." "Naturally," I said. "I was going to speak of it." "And your hands are not clean. That is as it should be. You are now ready to pay a ceremonial call. You perhaps don't understand. All our houses are on the same pattern, and each is provided with a fitted room for the purposes of the bath and the toilet. But when we pay a ceremonial call, it is our invariable custom to do so in a soiled and dishevelled condition. On arriving we make ourselves clean and tidy in our host's toilet-room. This is done by way of compliment. It implies that he possesses conveniences which we do not." "It seems to me singularly foolish, if I may say so." "From one point of view all compliments are foolish, but from the point of view of longevity all compliments are wise. They have a slightly emollient effect. We recognise this so much that we even employ at times professional optimists." "Won't you tell me about them?" "It is a very simple matter. If a being of the first class gets worried and depressed, he knows that this is lowering his vitality and lessening the period of his life. This knowledge only tends to increase the worry. He therefore sends at once to the Central Office for a professional optimist. The optimist comes and talks. He slightly emphasises all that is most favourable in the being's circumstances. He dwells on the strong points in his character. He listens to his stories. He shows himself impressed by his abilities. We have but a few of these professional optimists, and they are extremely well paid--that is to say, their power of ordering from the Central Office is very considerable." "Some of this seems to me rather childish," I said. "And some of it I do not understand." "You, a barbarian, can hardly be expected to grasp at once the refinements of a higher civilisation. You will do so gradually. Now, please, I have only just time to see the Professor before I keep my appointment at the Heat and Light Control. Come along, please."