XVI. THE RESPIRATORY PROCESS 
A. LOCATION OF THE EXTENT OF THE LUNGS BY 
PERCUSSION. 
For this exercise the subject should be loosely and thinly 
dressed. Place the index finger of the left hand upon various 
regions of the thoracic and abdominal wall of the living human 
subject, and listen to the sounds produced when the finger is 
tapped with the middle and ring fingers of the right hand. Note 
that over the lungs there is a hollow reverberating sound which 
is absent from other regions. Record the extent of the lungs upon 
outline drawings of the body, or upon the Suzuki manikin. 
B. CHANGES IN THE DIMENSIONS OF THE THORAX 
AND ABDOMEN OF THE HUMAN SUBJECT DURING 
RESPIRATION. 
A group of students may conveniently work together in obtain¬ 
ing these statistics. The subject must be loosely and thinly 
dressed. The measurements of width (from side to side), and 
depth (from front to back), are taken with calipers (pelvimeter), 
the girth measurements with a tape measure, and the height 
above the floor with an anthropometer. The records should be 
made in millimeters, and should be based upon averages obtained 
from at least five independent measurements of the same subject. 
i. Horizontal Measurements. 
(a) At the Level of the Lower End of the Sternum. 
Girth 
Depth 
Width 
Index 
d/w 
At the end of a natural exDiration. 
At the end of a natural insDiration. 
At the end of a forced exDiration. 
At the end of a forced inspiration. 
