This idea, however, is to a great extent erroneous, as the follow ing test will prove. A spirometer was obtained, and after fully inflating her lungs Miss Wallenda registered 137 cubic inches of air, and her two sisters, who were similarly tested, registered 210 and 204 cubic inches. The one who registered 210 inches has the largest lung capacity, yet she could not hold her breath longer than 2 mins. 18 secs. One of the authors also had his lungs tested, and was able to register 375 cubic inches, yet he finds great difficulty in staying under water even for one minute ; therefore, to rely entirely upon the results obtained from the spirometer would, we think, be most mis leading. We are of opinion that the physical development of the body, as compared with the lung capacity of the individual, must also be considered. Miss Wallenda, who was undet eighteen years of age, had a chest measurement of 27 inches when deflated, and 31 inches when fully inflated. Her height was 4 feet 9 inches, and her weight 6 st. 7 lbs. On the other hand, the one who registered 375 cubic inches of air stands nearly 6 feet, weighs i5 st. 4 lbs., and has a chest measurement
of 45 inches. Under the circumstances the physiology of the process of suspended respiration during an extended period leaves interesting points that have yet to be decided.
In judging these feats or comparing them with those of the sponge-divers and others, the fact that it is far easier to do them in a tank, and because the water is warmed, must not be over looked.
There is one great objection to this feat, and that is the ex ceedingly grave liability to serious or fatal injury. In the effort to prolong the time, insensibility will gradually steal over the performer, and if not quickly attended to dangerous complica tions may. ensue. The strain upon the lungs and the system generally is so great that special care has to be taken by experts. As soon as any inconvenience is felt, a rapid rise to the surface should be made. There have been cases of men fainting from exhaustion after prolonged immersion. The feat is such a dangerous one that it should never on any account be made the subject of competition.