PLATE 1 



EXPLAXATiOX OF FIGURE 



Radiograph of the heart of a man, height 5' llf", weight 146.3 lbs., 

 age 43. The right and left margins of the heart which are clear in the photograph 

 have been outlined with plain lines of white ink. The upper and lower borders, 

 which have been arbitrarily completed, are likewise shown by lines of white ink. 

 The silhouette area is 127.5 sq. cm. Reduced 6 per cent gives a net area of 119.9 

 sq. cm. The transverse diameter is 12.5 mm. Reduced 3 per cent gives 12.1 

 mm. as the net transverse diameter. Comparisons of the measurements of this 

 heart with the normal standard are as follows: 



The heart is close to the standard size from the standpoint of weight but is 

 small (vol. -166 cc, —19.3 per cent) from the standpoint of height. The indi- 

 vidual is decidedly thin from the standpoint of height and age. The width of the 

 silhouette is narrow compared with the area as we should expect in an individual 

 of this build. 



486 



