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  • If this apparatus of fluid contained in vesicles and canals constitutes a necessary and constant integer of these organisms, it undoubtedly implies a great complexity of structure. Such organisms are, therefore, not unicellular, but policellular. But compare a protozoon with an acknowledged cell—what a cell is, it is not easy to explain.

    --Thomas Williams, 1856, The British and Foreign Medico-chirurgical Review, vol. 18, p. 464

    March 19, 2008