direct function of the assay, that is the abundance. LIEBYs ( continued) Re propose that the experimental problaa be divided into two stages. What we call a pilot assay and then later a full scale asssy. And so, at the aownt, we're more con- cerned with setting up the pilot assay program. A set of satples aay be 3, 4 or 5 dosen maybe as many as a 100, wisely selected in the various realas, that is human material in the biosphere, seat, that is whether you can uss pigs as a substitute for husan beings, foodstuffs which are likely te contain caleiug, such ag silk and vegetabless various kinds of vogetables contain calciua. Using the caleium content as a guide to the likelihood of finding strontiun; strontium data are quite poor. Then to test the oceans, test the ataosphere, test the soils. fe do enough in the first set of 100 saxples to get a notion as to what the facte of life are, It's perfectly obvious that there's the widest type of fluctuetion to be expected in certain of these. Te would, I think, expect to find that the sea sight be the best mixed of all the realus. Zo seawater ts a good plac te begin te get a general notion. Ye have sose acasure- ments on seawater, in procress already. will be next best probably. The ataosphere There are vary curious questions here that we heard about earlisr this morning. rom. Apae Department HistthiaeS sud riba. hy 7a