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Rh were held to be as private as a man's theology is to-day. There was a time before that when his theology was held to be as public a matter as the color of his eyes. But infectious diseases, on the other hand, were once as private as the processes of a man's digestion. The history of the notion of privacy would be an entertaining tale. Sometimes the notions violently conflict, as they did when the bolsheviks published the secret treaties, or when Mr. Hughes investigated the life insurance companies, or when somebody's scandal exudes from the pages of Town Topics to the front pages of Mr. Hearst's newspapers.

Whether the reasons for privacy are good or bad, the barriers exist. Privacy is insisted upon at all kinds of places in the area of what is called public affairs. It is often very illuminating, therefore, to ask yourself how you got at the facts on which you base your opinion. Who actually saw, heard, felt, counted, named the thing, about which you have an opinion? Was it the man who told you, or the man who told him, or someone still further removed? And how much was he permitted to see? When he informs you that France thinks this and that, what part of France did he watch? How was he able to watch it? Where was he when he watched it? What Frenchmen was he permitted to talk to, what newspapers did he read, and where did they learn what they say? You can ask yourself these questions, but you can rarely answer them. They will remind you, however, of the distance which often separates your public opinion from the event with which it deals. And the reminder is itself a protection.