37 
On the Occurrence of Post-tetanie Tremor mm Several Types of 
Muscle. 
By Davip Fraser Harris, M.D., B.Sc. (Lond.), Lecturer on Physiology and 
Histology at the University of St. Andrews. 
(Communicated by John G. McKendrick, M.D., F.R.S. Received February 15,— 
Read June 27, 1907.) 
PART 
In 1901* I discovered that a frog’s gastrocnemius which had been kept in 
complete tetanus, either by direct or indirect stimulation, would, if the 
stimulation were continued until fatigue had begun to manifest itself, fall 
into a state of obvious tremor. This tremor, whose average periodicity in 
TAA WEN NAAT OTL MM SA UTS TA LT AS ANN NA MTN TN AN LTTE MMT TAGS 
Fie. 1.—Gastrocnemius, frog. Indirect stimulation. 5 grammes close to axle of lever 
giving amplification of 14. Upper tracing, “complete tetanus” for about 25 seconds ; 
lower tracing shows point of commencement of post-tetanic tremor. Periodicity at 
first 6 a second. Stimulation (Neef’s hammer) is recorded above time in half- 
seconds. (Reduced to 3.) 
* D. F. Harris, ‘Phys. Soc. Proc.,’ March 1, 1903. 
