Nothing, it seemed, was left for the individual to decide for himself. His every want was supplied by orderly arrangement and for everything he must have an authoritative permit. Had I not been classed as a research chemist, and therefore a man of some importance, this simple business of getting a hair-cut might have proved my undoing. Indeed, as I afterwards learned, the exclusive privacy of my living quarters was a mark of distinction. Had I been one of lower ranking I should have shared my apartment with another man who would have slept in my bed while I was at work, for in the sunless city was neither night nor day and the whole population worked and slept in prescribed shifts--the vast machinery of industry, like a blind giant in some Plutonic treadmill, toiled ceaselessly. The next morning I decided to extend my travels to the medical level, which was located just above my own. There were stairs beside the elevator shafts but these were evidently for emergency as they were closed with locked gratings. The elevator stopped at my ring. Not sure of the proper manner of calling my floor I was carried past the medical level. As we shot up through the three-hundred-metre shaft, the names of levels as I had read them in my atlas flashed by on the blind doors. On the topmost defence level we took on an officer of the roof guard--strangely swarthy of skin--and now the car shot down while the rising air rushed by us with a whistling roar. On the return trip I called my floor as I had heard others do and was let off at the medical level. It was even more monotonously quiet than the chemical level, save for the hurrying passage of occasional ambulances on their way between the elevators and the various hospitals. The living quarters of the physicians were identical with those on the chemists' level. So, too, were the quiet shops from which the physicians supplied their personal needs. Standing before one of these I saw in a window a new book entitled "Diseases of Nutrition." I went in and asked to see a copy. The book seller staring at my chemical uniform in amazement reached quickly under the counter and pressed a button. I became alarmed and turned to go out but found the door had been automatically closed and locked. Trying to appear unconcerned I stood idly glancing over the book shelves, while the book seller watched me from the corner of his eye. In a few minutes the door opened from without and a man in the uniform of the street guard appeared. The book seller motioned toward me. "Your identification folder," said the guard. Mechanically I withdrew it and handed it to him. He opened it and discovered the card from the hospital. Smiling on me with an air of condescension, he took me by the arm and led me forth and conducted me to my own apartment on the chemical level. Arriving there he pushed me gently into a chair and stepped toward the switch of the telephone.