Abstract

It is shown by the electron microscopic method that the large forms of the suspended organic matter in the sea is formed of microplankton after its death. Examining a process of origination of the suspended matter, the author could detect that protoplasm of diatom was spread out through the areolae of the frustule of diatom, and recognize that granular structure of the suspended organic matter was made from protoplasm of plankton cell. The author assumes that such structural features as organic granules take a part of turbidity factor of sea water. It is said that one cell or a colony of microplankton is the structural unit in origination of the suspended organic matter.The author expresses his hearty thanks to prof. S. Nomura of the Tohoku University, Sendai, for a number of valuable advice and to Messrs. M. Takahara and H. Takahara of the Zeshinkai Hospital who let me kindly use their electron microscope, for their continued hospitality of collaboration.

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