THE PULSE 



217 



At the third month the infant's pulse may be faster than at birt 

 owing to the increase of muscular activity. 



Large animals have a slower rate than small. The elephant has 

 a frequency of 25 to 30, the ox 36 to 40, the sheep 60 to 80, the dog 



Heart 



Carotid 



Femoral 



Radial 



Ant. til il 



Foot 

 (pletbysm.) 



Time iii 

 t 1 ,, second 



FIG. 119. THE PULSE WAVE IN THE ARTERIAL SYSTEM. (Waller.) 



100 to 120, the rabbit about 150, small birds and mice over 600. 

 In the last the rate is recorded by means of the electrical variation of 

 the heart. 



