To indicate if there is any regularity in the incidence of the maximum volume per respiration and the time of the experiment and for similar indications as to the appearance of the minimum, we present in table 112 the maximum, minimum, and average values for the volume per respiration of Squad A. The average volumes per respiration ranged from 520 c.c. with Can to 342 c.c. with Fre. (See footnote 2 of table 112.) These two men likewise represent the extremes in body-weight, Can having a body-weight of 79.75 kg. and Fre a body-weight of 57.50 kg.

Table 112. - Maximum, Minimum, And Average Volume Per Respiration Determined In Experiments With Respiratory Valve Apparatus1 - Squad A, Subjects Post-Absorptive And In Lying Position

1See table 111.

2 Values for Fre are as follows: Maximum, Oct. 5, 349 c.c; minimum, Oct. 11, 327 o.c; average, 342 c.c. 3 Computed to 37° C, saturated, and prevailing barometric pressure.

An examination of the relationship between the progress of the experiment and the maximum volume does not show any uniformity. While, with a certain number, the maximum volume is to be found at the beginning of the experiment, with three of the men it is noted as late as January 9 or thereafter. Similarly the appearance of the niinimum is not uniformly noted. Aside from the value for Fre, which is liable to misconception, owing to the shortness of the time in which he was studied, we still have a minimum value appearing with Man as early as October 19. With Bro, Can, Kon, Gar, Gul, and Pea the minimum occurs during the last half of January.

These measurements, it will be recalled, all refer to the total volume per respiration and were usually averaged from 100 or more respirations. Hence the actual maximum and minimum figures are of significance. The highest volume per respiration, 634 c.c, was noted with Gul on October 1 and 20. The absolute minimum, 346 c.c, was noted with Pea on January 24, 1918. Undue stress should not be laid upon either the minimum or maximum results, for obviously their significance is chiefly in the relationship to the respiration rate existing at the time. In general the volume per respiration of these subjects appears to be well within normal limits, with perhaps a slight tendency towards low rather than high values, when compared with normal subjects of similar age previously studied in this Laboratory.