240 
DR. A. D. WALLER AND MR. E. W. REID ON THE 
Photograph. 6. 
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A series of three photographs of variations of a Dog’s heart taken without moving the electrodes. 
</. Five minutes after death. The variation is monophasie, indicating negativity of apex. 
(3. Forty-five minutes after death. The variation is becoming diphasic; first phase apex negative to 
base ; second phase base negative to apex. 
In some of the variations the first phase is much more marked than the second, in others the second 
phase is the more marked. 
7. Sixty minutes after death. The variation has become uniformly diphasic, first phase apex negative to 
base; second phase base negative to apex, and the second phase is more marked than the first 
(Apex HoSO^. Variation N and NS.) 
