19 4. Collection of rain water which has percolated through undis- turbed soil shows that Cs Ce 144 137 , Ru 106 . -Rh 106 , 2c 95 -Nb 95 ”, Sb 125 and yo are being leached from the soil in very small but as yet undetermined amounts. 5. Cs 137 . . . + oe is the principal long-lived fission product taken up by the plants. The csi?” levels are higher in older leaves than in younger leaves. 6. There is a general potassium deficiency in the area. Fertili- zation experiments indicate that the potassium levels are associ. ated with Cs 7. 137 uptake by the plants. Variation in all types of soil and biological samples is com- monly as great as by a factor of five for a given type sample taken in an area of less than one square mile. 8. Evaluation of calcium levels in the soil in terms of absolute levels of available calcium is very difficult. although these are highly calcareous soils, It is clear that available calcium represents a small fraction of the total calcium. . tant relative to Sr 9. 90 This is impor- uptake. In general csi ?? and sr?° are the principal long-lived isotopes found in the land organisms while zn°>, co°?, mn>* and Fe>> are found in the marine organisms. The need for future studies on fallout in the ocean is in general similar to the needs for studies in the ocean related to