THE CHARTS — VARIOUS DISEASES. 79 



was relatively greater, though actually only about one-third as great ; and that the 

 increase of these diseases, accompanying an increase of age, was relatively greater than 

 that of diseases of the eye. As to height, however, we find about the sanae fluctuation 

 in the ratios. A comparison of the two charts with regard to the division " Nativity," 

 while it brings out no absolutely conclusive results, will be found to be interesting, and 

 to furnish subjects for thought and study. 



CHART X. 



DISEASES OF THE CIRCULATORY SYSTEM. 



This chart illustrates so well, or rather departs so little from, the general rules set 

 forth in the introductory remarks on the subject of the charts, that it requires no special 

 comment to make its indications interesting or intelligible. 



CHART XI. 



DISEASES OF THE HEART AND ITS MEMBRANES. 



In this chart will be noticed a remarkable deviation from the rule regarding an 

 increase of disease with an increase of age. The diminution in the ratio rejected.among 

 men over thirty-five years of irge is probably mainly ascribable to the two diametri- 

 cally opposite tendencies of the different forms of the disease. As coming under this 

 head— diseases of the heart and its membranes— only two forms, and those very com- 

 prehensive, were recorded, namely, "Acute disease of heart," and "Chronic disease of 

 . heart." We may reasonably suppose that a large share of the former were merely 

 functional derangements, while many of the latter were undoubtedly organic diseases- 

 Owing to the tendency of simple functional derangements to right themselves, or better, 

 perhaps, to disappear, from the effects of a change in the habits and surroundings of a 

 man as he grows older, and to the tendency of actual organic diseases to reach their 

 climax, and culminate in death at a comparatively early age, we should naturally look 

 for this diminution as regards the older men. Notwithstanding this falling-off in the 

 ratio as regards age, its increase Avith increase of height is continuous and wonderfully 

 regular. This fact, it must be admitted, points strongly to a correlation of heart-dis- 

 eases and height jjer se. 



CHART XII. 



DISEASES OF THE RESPIRATORY SYSTEM. 



The vaiious diseases composing this class, taken as a whole, show a strict con- 

 formity to the general tendency of other diseases, embodied in what have been termed 

 general rules, and the chart will undoubtedly l)e intelligible, and no less interesting, 

 without special comments. 



CHART XIII. 



DISEASES OF THE DIGESTIVE SYSTEM. 



The very high ratio of rejection on account of this class of diseases will be noticed ; 

 but, as hernia is included, the fact is not so remarkable. Tlie regularity of their increase 



