Numerous attempts have been made to correlate the vital capacity of normal subjects with other physical measurements. As long ago as 1846, Hutchinson examined its relationship with age, height, weight, and chest circumference in males. Though he found no uniform correlation between vital capacity and bodyweight and no correlation whatever with chest circumference, he stated that the vital capacity increased by eight cu. in. for every inch of height from five to six feet, and decreased by about one cu. in. per year after the age of thirty-five. Peabody and Wentworth (1917) examined 96 males and 44 females and found that, if each sex was divided into three groups according to height, 84 per cent. of the males and 68 per cent. of the females had vital capacities within 10 per cent. of the mean for their group. They also pointed out that nearly all of the subjects whose vital capacity fell outside this range had very large vital capacities, apparently as a result of athletic habit.Dreyer (1919), however, found that in sixteen normal males the vital capacity showed an approximately equal correlation with weight, standing height, stem height, and chest circumference but a much closer correlation with surface area. His findings were confirmed in a much larger group of both sexes by West (1920).Cripps, Greenwood, and Newbold (1923) examined 950 males passed as fit for service in the Royal Air Force and obtained a correlation coefficient of 0 59 between vital capacity and standing height. Correlation coefficients of vital capacity with stem height, weight, chest circumference, and age were all lower (at 0 54, 0 50, 0 39, and -0-1 respectively), while a multiple correlation between vital capacity and all five variables was 0 64. Cripps (1924) found a different order of correlations in 481 normal females in whom chest circumference showed the highest correlation with vital capacity at 0 47, while the correlation coefficients of vital capacity with weight, standing height, and stem height were 0 44, 0 40, and 0-36 respectively. Baldwin, Cournand, and Richards (1948) determined the vital capacity in a group of 52 normal males with ages ranging from 16 to 69, and obtained correlation coefficients of +0 485, +0 436, +0 227, and -0 432 with height, body surface, weight, and age respectively, while in a group of forty normal females with an age range of 16 to 79 they found correlation coefficients of +0 501 with height, +0 263 with body 113 on 1 May 2019 by guest. Protected by copyright.