I regret to have to write you that I will probably have to withdraw from the proposed volume on radiobiology, in which you
had kindly asked me to participate, with a chapter on ultrviolet effects on bacteria. I shall be leaving for the summer in
about six weeks, and I hve too much else to do in that time to be able to think about this chapter. I hope that you can find
a suitable alternative author, or that the organization of the volume can be appropriately shifted. In any event, please
accept my apologies for any inconvenience that this may cause, but I can see no way to meet the obligation by the deadline.