AN illustration is not an argument. But this fact is overlooked by certain ones who are trying to demonstrate the necessity for Sunday-rest laws by a diagram showing the human system in a continuous physical and mental decline through the week from Monday morning to Saturday night, and recovering its lost force at a single bond by keeping Sunday. The thing works so nicely by diagram that it seems quite unnecessary to cite actual experience, past or present, for further proof. But what about the traditional “blue Monday” with which the housewife is so commonly afflicted? It is quite a common impression, also, that more business is transacted on Saturday than any other day of the week, which does not quite harmonize with the supposed state of things as represented by the little diagram. We would suggest that if the diagram be changed so as to represent a downward plunge of the physical and mental faculties on Sunday, with a gradual rise throughout the week, it would accord much more nearly with the facts.