48 Dr. D. F. Harris. On the Occurrence of — [Feb. 15, 
post-tetanic tremors, and this irregularity also characterises even those 
tremors which are produced by the so-called “constant” stimuli and also 
certain tremors of “ spontaneous” origin. 
Fig. 13.—Gastrocnemius, frog. Sciatic nerve drying. Bell-crank lever; no weight. 
Time in half-seconds. Periodicity of tremor, 4 to 6 a second. (Facsimile.) 
Fie. 14.—Gastrocnemius, frog. Solid NaCl placed on sciatic nerve. Bell-crank lever ; 
no weight. Time in half-seconds. Periodicity of tremor, 5 to 7 a second. (Facsimile.) 
Fic. 15.—Gastrocnemius, frog. Sciatic nerve pinched. LBell-crank lever ; no weight. 
Time in half-seconds. Periodicity of tremor, 6 a second. (Facsimile.) 
With regard to tremors due to “constant” or “single” stimuli, we have 
the tremors from (1) drying of the nerve; (2) chemical stimulation of the 
nerve, ¢.g., by NaCl; (3) pinching the nerve; (4) heat suddenly applied to 
the nerve; and (5) the disappearance of anelectrotonus from the nerve: while 
the tremor of the dying diaphragm is an example of the “spontaneous ” kind 
(cf. fig. 10). 
