. Human physiology : designed for colleges and the higher classes in schools, and for general reading. VERTICAL SECTION OP , Transverse section. B, Separated prisms of it. 205. Perhaps the most wonderful exhibitions of the functionsof the cell are presented to us in the nervous system. Thenerves are bundles of tubes of exceeding fineness. They varyfrom TcVotn to i u,o o tith of an inch in diameter. Now, eachof these little tubes, or tubuli, as they are called, was once achain of cells. The cells in each chain or row, as the micros-

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