Abstract
IT has often been suggested that by far the greatest production of organic matter on earth is due to the marine plankton algae. Investigations are, however, extremely scarce. In some few areas the quantities of organic matter produced have been calculated by means of indirect methods, as, for example, from the decrease of nutrient salts or carbon dioxide during a definite period. The quantities calculated are, at best, minimum values for production, as account could be taken neither of the carbon dioxide absorbed from the atmosphere or produced by respiration of animals and bacteria, nor of the nutrient salts regenerated during the period and utilized again1.
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