458 C. R. BARDEEN 



vessels and cardiac fat from the heart weight so as to get the 

 proportion between the heart muscle tissue and the body weight. 

 With the heart muscle tissue the connective tissue framework 

 and the intrinsic blood vessels of the heart are, however, included. 

 The following tables (tables 10 and 11) show the relation of the 

 weight of the heart muscle tissue to body weight found by W. 

 Miiller: 



From these tables it may be seen that the average percentage 

 of body weight made by the heart muscle tissue in the males 

 studied by W. Miiller was 0.534 per cent; 52.8 per cent, in those 

 above one year of age. In the females studied by W. Miiller 

 the average is slightly lower, 0.523 per cent; 0.50 per cent for 

 those above one year of age. The range in the various weight 

 groups is for males from 0.590 per cent for the 1-10 K. weight 

 group to 0.391 per cent in the 100-110 K, group; for females from 

 0.584 per cent in the 1-10 K. group to 0.302 per cent in the 

 100-110 K. group. For each weight group Miiller gives the 

 average height and average age. In a subsequent section I 

 give a brief description of statistical data relating to the normal 

 weight for a given height and age. From the average height 

 and average age for each weight group in the Miiller table we 

 may estimate a normal weight in contrast to the actual body 

 weight. By dividing the average heart weight of each group 

 b}^ the estimated normal body weight we get the percentage of 

 estimated normal body weight. This percentage indicates 

 what the ratio of heart weight to body weight would be if the 

 body weight were normal for height and age and the heart weight 

 that actually found. This per cent of normal' body weight is 

 smaller than the per cent of actual body weight for the lighter 

 groups, greater in the heavier groups, indicating that the majority 

 of individuals in the former groups were underweight from the 

 standpoint of height and age; those of the fatter groups over- 

 weight from the standpoint of height and age. The heart mus- 

 culature is heavy compared with the body weight in thin indi- 

 viduals, light compared with the body weight in fat individuals. 



By taking the mean between the heart weight-body weight 

 ratio actually found and that which would have been found had 



