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EXPERIMENTAL PHYSIOLOGY 



must be closed by a clip) provided with valves (see diagram, fig. 75), 

 allow the subject to breathe during one minute into a carefully 

 balanced spirometer. Count the number of respirations in the given 

 time and note the amount of air which has been breathed in that 

 time. From these results calculate the tidal air passing through 

 the lungs with each respiration. The observation should not be 



A 



1! 



FIG 7c. PRONE-PRESSURE METHOD OP ARTIFICIAL BESPIRATION. A, PRESSURE 



BEING APPLIED ; B, PRESSURE REMOVED. 



begun until the subject is breathing regularly arid unconsciously, and 

 he must not be permitted to see the spirometer. 



Reserve air, supplemental air, vital capacity. Determine in your 

 own person with the spirometer the amounts of each of these and 

 note down the results. 



Measurements of the chest and abdomen in deepest inspiration 

 and in deepest expiration. Determine these upon yourself (a) at the 

 level of the armpits, (6) at the level of the lower end of the 

 sternum, (c) at the level of the umbilicus, using a tape measure. 

 Note down the results. 



Artificial respiration in man. Place the subject flat on the ground 



