48 
in the ordinary way on a rotating smoked drum, at the same time 
as a time curve giving 0.1 of a second. The recording Margy-tambours 
gave a magnification of the muscle thickening of only 3 times; the 
Fig. 1. 
recording levers weighed about 11 milligrams, their length being 
7 centimeters. 
With this apparatus (fig. 1) a great many records of footcloni 
were taken. As a matter of fact a visual and tactile examination 
was first made, and a graphical record was only taken either to 
make sure in a doubtful case, or more often to have a permanent 
record of some fact otherwise observed. In by far the most cases 
the apparatus was not needed, as during the clonus not the slightest 
contraction could be either seen or felt in the dorsal extensors of 
the foot or their tendons. Palpation in these cases is a very reliable 
mode of examination, especially if the hand be rested on the edge 
of the tibia. In the commencement of my series of experiments Ì 
made a good many records, just to make sure that a clonus was 
only a simple one. But I soon found that if no contractions could 
be felt, the recording lever invariably made a straight line. 
