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Several species of Potamogeton and Myriophyllum from New Jersey were collected and analyzed for 11 elements. Wide variations were observed in the inorganic composition of the plants, both within species and among species. In some instances, there appeared to be a relationship between the content of a specific element in a plant sample and the content of that element in the water in which the plants were growing. The nitrogen content of the plants was sufficiently high so that no extra nitrogen would be required to prepare composts from them.