In pursuing the histological investigations which form the subject of the present communication I have endeavoured to discard from my mind every kind of theoretical bias, and to record only what was actually experienced as the results of purely practical observation. The drawings are not intended to illustrate any interpretation of what was observed, but are faithful representations of the objects seen, and served for the following descriptions, which will be as concise as the nature of the subject will permit. The tissues obtained for examination w’ere used in a perfectly fresh state, and with the addition only of water or dilute glycerine. I shall begin with the muscular fibre of the bird.

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