232 EXPERIMENTAL PHYSIOLOGY. 



use, including those of Marey (Fig. 107), Burdon-Sanderson, and 

 the pansphygmograph of Brondgeest. Use any of them. 



(a ) Place the patient on his Lack with his head supported 



011 a pillow. Feel for the 

 cardiac impulse between the 

 fifth and sixth ribs on the 

 left side, and about half an 

 inch inside the mammary 

 line. 



(I.) Arrange the cardio- 

 graph by connecting it 

 (Fig. 107) with stout india- 

 rubber tubing to a recording 

 Marey's tambour adjusted 

 to write on a drum (Fig. 

 76). It is well to have a 

 valve or a T-tube capable 

 of being opened and closed 



Fig. 107. Marey's Cardiograph. 

 p, Button placed over cardiac 



,,, ~~ L _... between the receiving and 



impulse ; x, screw to regulate the , . & , 



projection of p; t, tube to other recording tambours, in order 

 tambour. to allow air to escape if the 



pressure be too great. 



(e.) Adjust the ivory knob of the cardiograph (p) over 

 the cardiac impulse where it is felt most, and take a tracing. 

 Fix, varnish and study the tracing. 



4. Meiocardia and Auxocardia. 



(a.) Bend a glass tube about 20 mm. in diameter into a 

 semicircle, with a diameter of about 6 to 8 inches. Taper 

 off one end in a glass flame to fit a nostril, and draw out 

 the other end of the tube to about the same size. Round 

 off the edges of the glass in a gas flame. 



(b.) Fill the tube with tobacco smoke, place one end of it 

 in one nostril, close the other nostril, cease to breathe, but 

 keep the glottis open. Observe that the smoke is moved in 

 the tube, passing out in a small puff during auxocardia i.e., 

 when the heart is largest ; while it is drawn further into 

 the tube during meiocardia i.e., when the heart is smallest. 



