Page:Life in Motion.djvu/89

LECTURE III
Study of tetanus or cramp—Simple contraction and muscle curve—Muscle sound—Elasticity of muscle—Inherent irritability of muscle—White blood corpuscles—Cilia—Structure of muscle—End-plates in muscle.

To-day we shall, in the first place, study tetanus or cramp. For this purpose, I have fitted up the usual preparation, with which Fig. 32.—Steel spring for making and breaking the primary circuit of induction coil. The point on the left is caused to dip into mercury, and thus make contact. See Fig. 29. you are now familiar, and I have made arrangements for opening and closing the primary circuit of the induction machine by means of a long flat spring. Here is the