4 INTRODUCTION 



THE NORMAL FIGURES. The data forming the basis 

 for the calculation of the present Tables in the case of 

 normal, healthy men and women are derived from the 

 analysis of a number of observations sufficient to ensure 

 a degree of accuracy that should prove entirely satis- 

 factory. While it cannot be claimed that the constants 

 employed for the various indices given in the Tables are 

 to be regarded as fixed and final, it can be stated that 

 any changes they may have to undergo in the future, 

 as a result of the further accumulation of data, in normal 

 adolescents, men, and women, will be small and not 

 likely to impair their present validity from the practical 

 point of view. 



I should like to record our thanks to the Medical 

 Research Council for the help they have afforded us 

 in enabling us to test the Tables on a large material 

 already collected under their auspices, as well as to Dr. 

 A. J. Jex-Blake, Physician to St. George's Hospital, 

 Mr. H. F. Pierce, late Major American Medical Air 

 Service, and Dr. F. G. Hobson, D.S.O., for valuable 

 assistance rendered during the preparation of the Tables. 



G. D. 



