t has long been recognized that the biological productivity of the sea depends primarily upon the nutrition of the phytoplankton. The aim of these experiments was to study this basic process in the cycle of production by the artificial increase of those plant nutrients most likely to become limiting. For our purpose a body of water was re quired which was large enough to be representative …
Statement of the Problem.—In a previous communication, Winsor and Walford (1936) analyzed the results of repeated vertical hauls of different types of plankton nets, making use of data available in the literature. They concluded that the observed rcsidts could be accounted for reasonably well on the assumptions that (a) the organisms were randomly distributed in the medium and (b) that t…