I voiced to him my grave misgivings, first on the basis of my belief that Japan was already defeated and that dropping the bomb was completely unnecessary, and secondly because I thought that our country should avoid shocking world opinion by the use of a weapon whose employment was, I thought, no longer mandatory as a measure to save American lives. It was my belief that Japan was, at that very moment, seeking some way to surrender with a minimum loss of "face".

The chief lesson I have learned in a long life is that the only way you can make a man trustworthy is to trust him; and the surest way to make him untrustworthy is to distrust him. If the atomic bomb were merely another, though more devastating, military weapon to be assimilated into our pattern of international relations, it would be one thing. We would then follow the old custom of secrecy and nationalistic military superiority relying on international caution to prescribe the future use of the weapon as we did with gas. But I think the bomb instead constitutes merely a first step in a new control by man over the forces of nature too revolutionary and dangerous to fit into old concepts. My idea of an approach to the Soviets would be a direct proposal after discussion with the British that we would be prepared in effect to enter an agreement with the Russians, the general purpose of which would be to control and limit the use of the atomic bomb as an instrument of war.

You have asked for the comment, in writing, of each cabinet officer on the proposal submitted by Secretary Stimson for the free and continuous exchange of scientific information (not industrial blueprints and engineering "know-how") concerning atomic energy between all of the United Nations. I agreed with Henry Stimson.

At the present time, with the publication of the Smyth report and other published information, there are no substantial scientific secrets that would serve as obstacles to the production of atomic bombs by other nations. Of this I am assured by the most competent scientists who know the facts. We have not only already made public much of the scientific information about the atomic bomb, but above all with the authorization of the War Department we have indicated the road others must travel in order to reach the results we have obtained.

With respect to future scientific developments I am confident that both the United States and the world will gain by the free interchange of scientific information. In fact, there is danger that in attempting to maintain secrecy about these scientific developments we will, in the long run, as a prominent scientist recently put it, be indulging "in the erroneous hope of being safe behind a scientific Maginot Line."

The nature of science and the present state of knowledge in other countries are such that there is no possible way of preventing other nations from repeating what we have done or surpassing it within five or six years. If the United States, England, and Canada act the part of the dog in the manger on this matter, the other nations will come to hate and fear all Anglo-Saxons without our having gained anything thereby. The world will be divided into two camps with the non- Anglo-Saxon world eventually superior in population, resources, and scientific knowledge.

We have no reason to fear loss of our present leadership through the free interchange of scientific information. On the other hand, we have every reason to avoid a shortsighted and unsound attitude which will invoke the hostility of the rest of the world.

In my opinion, the quicker we share our scientific knowledge the greater will be the chance that we can achieve genuine and durable world cooperation. Such action would be interpreted as a generous gesture on our part and lay the foundation for sound international agreements that would assure the control and development of atomic energy for peaceful use rather than destruction.

The military advantages and the saving of American lives achieved by the sudden use of atomic bombs against Japan may be outweighed by the ensuing loss of confidence and by a wave of horror and repulsion sweeping over the rest of the world and perhaps even dividing public opinion at home.

From this point of view, a demonstration of the new weapon might best be made, before the yes of representatives of all the United Nations, on the desert or a barren island. The best possible atmosphere for the achievement of an international agreement could be achieved if America could say to the world, "You see what sort of a weapon we had but did not use. We are ready to renounce its use in the future if other nations join us-in this renunciation and agree to the establishment of an efficient international control.

The bomb that hurried Russia into Far Eastern war a week ahead of schedule and drove Japan to surrender has accomplished the specific job for which it was created. From the point of view of military strategy, $2,000,000,000 (the cost of the bomb and the cost of nine days of war) was never better spent. The suffering, the wholesale slaughter it entailed, have been outweighed by its spectacular success; Allied leaders can rightly claim that the loss of life on both sides would have been many times greater if the atomic bomb had not been used and Japan had gone on fighting. There is no answer to this argument. The danger is that it will encourage those in power to assume that, once accepted as valid, the argument can be applied equally well in the future. If that assumption should be permitted, the chance of saving civilization - perhaps the world itself - from destruction is a remote one.