1903-4.] Prof. Schafer on Artificial Respiration in Man. 47 
Remarks . — The average number of respirations was 13 6 per 
minute, and the amount of air exchanged works out at 295 c.c. 
per respiration, and 4020 c.c. per minute. Very little physical 
exertion is required with this method, especially with the patient 
on the floor, since it merely consists in throwing the weight of the 
operator’s body forward upon his hands and alternately swinging 
back to relieve the pressure. The amount exchanged in this 
experiment, although far more than by the Silvester method, was 
not up to the tidal air standard, but the deficit was not sufficient 
to cause any feeling of distress to the subject of the experiment 
during the minute that each bout of respirations lasted. 
Table Y. — Marshall Hall Method* (The patient is laid prone 
and rolled over to one side and back again, and so alternately. 
When in the prone position, pressure was during three of 
the five-minute intervals exercised upon the back of the 
chest.) 
Number of 
Inspirations. 
Amount of Air 
in Cubic Cent. 
1st minute (with pressure), 
13 
3,100 
2nd ,, (with pressure), 
3rd ,, (without pressure ; rolling 
14 
3,500 
only) 
4th minute (without pressure ; rolling 
12 
2,400 
only), 
12 
2,200 
5th minute (with pressure), 
12 
3,300 
In 5 minutes, ..... 
63 
j 14,500 c.c. 
air exchanged. 
respirations. 
Remarks. — The average number of respirations was 12*6 per 
minute, and the amount of air exchanged per respiration comes to 
230 c.c. If the three minutes during which pressure was alter- 
nated with the rolling over are alone taken into consideration, 
the exchange with each respiration works out at 254 c.c. The 
rolling without pressure gave 192 c.c. per respiration. Since the 
method as recommended by Marshall Hall embraces alternating 
* Marshall Hall, Prone and Postural Respiration in Drowning , etc., 
London, 1857. 
