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 so far as the human organism is concerned, by the very completeness of the knowledge of it.

Did time permit it would not be difficult to show, as indeed has in part already been done, that as the intimate structure of the tissues became revealed, so was the way cleared for a sounder Physiology, whether by a more rational understanding of what observation and experiment had disclosed, or by indicating the direction in which observation and experiment might be fruitfully continued.

The progress of histological research has been marked by one great feature far-reaching in its effects and of fundamental importance—the recognition of the cell as the tissue unit. And whilst this has served to give completeness to the views of tissue structure, and especially of