test site, For stations nearest the wn me. distance of sample from test site. values for the post test samples were several hundred times greater than for the pre-test samples. Since the counts of "Fe(0H)3 scavenge" and "Ca-Sr oxalate" do not equal the count of "whole sample" evidently all of the radioactive materials were not removed by these processes. A rain water sample was collected 33 hours after the Mike shot in the lagoon off Eniwetok Island. was evaporated and counted on November 4, A 450-ce sample 87 hours after Mike, using a Victoreen survey meter with &@ one-inch end window tube, window thickness 1.8 mg/om’. The maximum count was 10,000 per minute. k.2 Plankton The plankton nets were + meter in diameter and 2 meters long. The anterior section was cylindrical, section conical with a detachable net end. were made in pairs, One net of each The plankton tows at the surface and during daylight hours. pair was constructed with No. 6 silk (74 meshes per inch) and the other of No. inch). the posterior 12 silk (173 meshes per Towing time was usually one hour and the distance towed was about 13 miles. Catches of plankton were small. Exclusive of jelly fish the greatest volume of plankton in a one-hour tow was 28 cc. This value was obtained by decanting and measuring the preservative and then subtracting this amount from the volume of preservative and plankton. A gross examination of the types of organisms present - 22 - * f € wa ker