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elements of Bowman, after their discoverer Sir William Bowman, so well known in this Institution, are the parts of the fibre that show contractility. By special methods of preparation, Professor Schafer and others have shown us that the structure of muscle is even more complicated, and that there are peculiar rod- Fig. 47.—B, human muscular fibre magnified 560 times showing the light and dark hands; k, nuclei; g, Dohie's line. A, the end of the muscular fibre of a frog magnified 240 times splitting into fibrils, f; k, nucleus. like bodies having little knobs at their ends running longitudinally in the fibre. These are not seen in the diagram (Fig. 47). It would only weary you to attempt to explain the theories held by histologists (those who endeavour to investigate the nature of tissues) as to the real nature of a muscular fibre. Suffice