the atmosphere is capable of maintaining stratification boosts for long periods of time as shown by moisture which argues against these moves and then at other times it is capable of going through tresendous overturnings. Either vertically, by weans of convection, or slant-vwise, by ceans of adiatatic processes. KELLOGG I think that we all agree with you on that it is very difficult and runs through a big range of variation. We will forego the individual reports of the committees chairmen in the iuterest of getting a discussion of Gabriel started. As you probably already know, the conelusions of the old Gabriel report vere that it vould require of the order ef 5 x 10° or around 10° neatnal bombs to bring the world up to o "mean lethal” evel of Sr’. Im the policy and Classification meeting yesterday, a calaulation of this was redone, and I understand there was some consternstion regarding the resuites. Y think that it hes been froned out, and I vould like to ask Dr. Bethe to give a short talk on that. BETHE: Most of us were rather perturbed at the vide latitude of figures vhich were floating around, and I.am not sure vhether we really can come to any definitd figures but at least ve bave tried to straighten out some of them. One of the questions which we discussed (this was particularly Lauriteen, Bacher, and myself) is the question of the tolerance dose end lethal dose for beta rays as coupsred vith alpha rays, and ve had several things to go by but the argument which we finally decided on was the following. ‘There is an acceyted tolerance figure for gama rays for vhole = DUE ARCHIVES t. as! Sas WEXLER: