218 
DR. A. D. WALLER AND MR, E. W. REID ON THE 
character is more pronounced at the base than at the apex, and may be entirely absent 
from the auricle when it is present in the ventricle. (Tracings 1, 2, 3.) 
3. A third feature is sometimes very marked in such cases where the decline in 
force and frequency is not regular. A pause of unusual length is followed by a beat 
Tracing 1. 
Cat’s heart. Record begins 1 minute, ends 18 minutes, post mortem. Dicrotism supervened at end of 
1st minute, and continued so until 18th minute, when delirium cordis supervened. Reduced. 
Note.— The tracings on smoked paper were taken on a cylinder having three rates of revolution. All 
tracings read from left to right. 
1. Quick rate, 1 mm. of surface = '004 second. 2. Middle rate, 1 mm. of surface = - 022 second. 
3. Slow rate, 1 mm. of surface = T5 second. 
Tracings 1 to 8 inclusive are taken with the slow rate. Tracings 9, 10, 11, 14, and 15 inclusive are 
taken with the middle rate. Tracings L2 and 13 inclusive are taken with the quick rate. 
of unusual height (Table C, Tracing 4). This sign of restorative action during rest 
occurred with very different frequencies. It is noteworthy, however, that in bigeminal 
tracings stronger contraction is not preceded by a longer pause, nor the weaker con¬ 
traction by a shorter pause. 
4. Beats in groups are sometimes seen as an irregularity (Tracing 4). 
