The theory that underlies physiology is that all function is due to chemical changes taking place xvithin the living organisin; and, further, that the functional activity of a specialized tissue depends primarily upon these changes in its individual cells. That these changes may reach a magnitude easily demonstrable with the3 microscope has been proved, as every one knows, for the cells of certain glands. My present purpose is to ascertain to what extent and by what methods changes due to the functional activity of ganglion cf311s ma;y be in like manner demonstrated.
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C. F. Hodge (1889) studied this question.