CONSTITUTIONAL DISEASES. 



THE diseases to be discussed in the following sections I have termed 

 constitutional diseases, in contradistinction to the diseases of the or- 

 gans, which have been thus far described ; because, from its greater 

 comprehensiveness, this term appears to me preferable to the names 

 djscrasias and cachexias, or diseases of the blood, as I originally in- 

 tended to call them. I shall first discuss the acute infectious diseases, 

 then chronic infectious diseases, and, lastly, the general disturbances 

 of nutrition, which do not depend on infection, but, at the same time, 

 shall confine myself to those complaints which occur in Germany. In 

 regard to exotic diseases, with which I am not personally acquainted, 

 and for whose description I should have to rely entirely on other 

 authors, I refer to the excellent works of Griesinger and Hirsch, 

 where the descriptions of these diseases are as concise as they are 

 complete. 



SECTION I. 

 ACUTE INFECTIOUS DISEASES. 



CHAPTER I. 



MEASLES MOKBILLI KTJBEOLA KO UGEOLE. 



. ETIOLOGY. Measles is a purely contagious disease. There is no 

 doubt that a person is never affected with measles without having 

 been infected by a person with measles. This assertion has been ob- 

 jected to, on the ground that the first case of measles could not have 

 been induced by infection, because at that time there was no measles 

 for the patient to be infected from ; and it is asserted that, if the dis- 

 ease developed spontaneously once, there is no reason for denying the 



