to be made. Whether we go ahead, and just what we decide to do can be greatly influenced by the ideas brought out in this meeting, and by the degree of interest shown here and later by other agencies in the possibilities of cooperative efforts. We hope, too, that the proceedings of this meeting will provide a good compendium of the state of the art at this time for the use of all those who have interests in this subject but could not be present. We are very grateful to the Sandia Corporation and to Dr. Shreve for serving as host for this meeting and for all the pleasant arrangements which they have made. 11-12