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certain diseases, and which may be variously blended in 

 different individuals, whilst the original type is more or less 

 preserved. I now enumerate the classification of diatheses 

 given by Mr. Jonathan Hutchinson, which is as follows : 



The scrofulous or tubercular ^ 



The rheumatic ^Universal. 



The catarrhal J 



The malarial 1 -,.. 



V Climatic. 

 The bronchocele J 



The gouty and hsemorrhagic A 



The leprous [Dietetic. 



The scorbutic f 



The rachitic / 



The diathesis of malignant new growths. 



The diathesis of senile degeneration. 



The visceral diathesis. 



Specialised diathesis (chilblains, feeble vascularity, etc.) 



I shall now briefly consider the foregoing diathetic varieties 

 as exemplifying not only the influence of heredity in pre- 

 disposing to disease, but its power as a factor in differentiating 

 man from man in his morbid predispositions. 



The Scrofulous and Tubercular Diathesis. I regard scro- 

 fula and tuberculosis as modifications of the same inflam- 

 matory process the former usually resulting in the develop- 

 ment of tubercle, although the typical inflammatory process 

 of scrofula may not attain a distinctly tuberculous condition. 

 At the same time, the proneness to tuberculosis may be so 

 potent that it is produced as a lymphatic neoplasm, without 

 an inflammatory exciting cause, and without the occurrence 

 of preceding congestion. In the case of both forms of 

 inflammation a predisposing, as well as an exciting cause, is 

 generally present the first being hereditary, and the second 

 acquired and the greater the degree of the former, the less 

 is the need for the latter. Thus we see that as in scrofula so 



