The Space Group of Potassium, Rubidium and Caesium Sulphates.

above. For example, does each carbon atom of the ring in phenol lack one electron of filling its eight "possible electron positions" or do three of the carbon atoms lack two electrons each while the remaining three carbon atoms have all their "possible electron positions" filled, or is there some other combination? In conclusion, the main purpose of presenting this detailed scale model of the benzene ring at this time is to offer a means by which the results of the X-ray analysis of benzene derivatives can be interpreted and the fine structure of their lattices determined. Finally, I wish to express my thanks to Professor Henry G. Gale for his interest in this work.