I. The Croonian Lecture. Microscopical observations on the suspension of the muscular motions of the vibrio tritici

The Croonian Lecture has usually been given by Members who had made physiology their particular study; and I should have not ventured upon this task, had I not been encouraged by one of our Vice-Presidents, who has now, for some years, applied my microscopical observations in promoting physiological enquiries into the more minute parts of animal structure. Without his authority, I should not have ventured to bring forward the following observations, respecting the length of time the moving powers of an animal, too small to become the object of sight without the assistance of the microscope, can have its action suspended, and again, by a change of cir­cumstances, renewed.