Electrocardiograms were recorded by means of needle electrodes from 40 adult cats and 17 kittens lying on their right side under nembutal anesthesia. In order to investigate various leads of ECG, A-B lead, V_A lead, V_B lead, standard limb leads and augmented unipolar limb leads were adopted for recording. The results obtained are snmmarized as follows
1) ECG patterns recorded by A-B, V_A, V_B, II, III and aVF lead were almost constant, but those by the other leads were variable.
2) Even under anesthesia, the amplitudes of various waves in I, aVR, and aVL lead showed a large variation.
3) The results suggest that A-B lead may develop the clinical ECG of the cat.
4) The normal ranges of the duration, interval, and amplitude of waves in A-B lead are listed in Table 4.

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Clinical and electrocardiographical observation was made on a case of artial premature beats in the racehorse. Arrhythmia was detected in the electrocardiographic examination after a race in which a filly had dropped out. In electrocardiograms, atrial premature beats frequently occurred in pairs or in groups. Atrial premature beats were almost completely prevented from occurring by treatment with propranolol. Discussion was made on electrocardiographical data obtained and their clinical significance.

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Electrocardiogram was recorded in a female lion two months old weighing 11kg by the A-B leads and standard limb lead II under the sodium pentobarbital anesthesia.
The pattern of the electrocardiogram showed a positive P wave, Rs or qRs type of QRS complex and a positive T wave and was similar to those of human, dog and cat. The electrocardoigraphic values were almost the same as those from the other reporteres except the QT and T interval.

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