1903-4.] Prof. Schafer on Artificial Respiration in Man. 45 
Male; age, 23; occupation, laboratory attendant; height, 5 feet 
inches (P71 ni.); chest measurement (at mammary line and 
in full inspiration), 38J inches (0'978 m.); weight, 10 stone 1J 
lbs. (64 kilog.) ; vital capacity, 4450 c.c. 
Table I. — Tidal A ir of Natural Respiration — supine position. 
Number of 
Respirations. 
Amount of Air 
in Cubic Cent. 
1st minute, ..... 
14 
6,700 
2nd ,, 
13 
6,200 
3rd ,, 
14 
6,500 
4th , , 
13 
6,600 
5th ,, 
12 
6,300 
In 5 minutes, ..... 
66 
32,300 c.c. 
respirations. 
air respired. 
Remarks. — The average number of respirations per minute was 
13. The average amount of air exchanged per respiration was 
489 c.c., and per minute 6460 c.c. 
Table II. — Tidal Air of Natural Respiration — prone position. 
Number of 
Respirations. 
Amount of Air 
in Cubic Cent. 
1st minute, 
12 
5,300 
2nd ,, 
12 
6,000 
3rd , , 
12 
5,000 
4th ,, 
13 
4,200 
5,700 
5th ,, 
13 
In 5 minutes, ..... 
62 
respirations. 
26,200 c.c. 
air respired. 
Remarks. — This gives about 12 \ respirations per minute, with 
an air exchange per respiration of 422 c.c., and per minute of 
5240 c.c. 
Combining the results given in Tables I. and II., the tidal air of 
the individual under experiment averages 456 c.c. 
