DRAFT a, plankton observations where the counting rate was very small, the probable error was usually greater than 8%, often es much ag 50% and occasionally over 100%, 2-3 RADIOACTIVITY IN OCEAN WATER Samples of sea water taken at varicus deptns at ten of the hydrographic stetions vere used in this study. 4 150 mi. volume of the water from each sample was evaporated to dryness and the resulting selt asssread for racionctivity, each station. Table The salinity valvas are listed cnly for statien variations in activity with the slight variation thet exists in salinity. surface sauples of the water at several stavions were filtered through a 0.9 micron millipore filter in cracr to LVity were present in the 2 ssSean = Gissslved se Aten aAn substances ot end: mae? wes pee or cs paervictlete meatier wae bey - Ercaver wnan . the surface particulate matter is largely composed of Living h