1907.| Post-tetanic Tremor in Several Types of Muscle. 39 
half an hour, at the end of which time, while the muscle was still irritable, it 
was so feeble that a weight of 20 grammes had to be substituted. The 
average periodicity of the tremor is three to five per second. 
Stimuli from 100 a second tuning-fork in 
Onset of coarse tremor, 8 seconds from commencement 
(With a lens a tremor can be seen during the complete 
10 grammes, same lever as in fig. 1. 
Periodicity, 8; later, 5 to 6 a second. 
primary circuit, recorded below time in half-seconds. 
tetanus, of periodicity 16 to 18 a second.) 
of tetanus. 
Fie. 24.—Gastrocnemius, kitten. 
In only one case, in mammalian muscle, did I obtain a rate slower than 
three to four per second, viz., one to two a second (fig. 4). Here the 
