32 RECEXT DEVELOPMENTS OF THE 



familiar with a pretty long list. Amongst the diseases of animals 

 we have Chicken-Cholera, Charbon, Pig-Typhoid, and the Silk- 

 worm disease. Amongst human diseases we have Anthrax, 

 Erysipelas, Septicaemia, Typhoid Fever, Relapsing Fever, Malarial 

 Fever, Cholera, Lepra, and Tuberculosis, in all of which the 

 specific character of the observed micro-organisms is now admitted. 

 The list of Enthetic diseases given by Dr. Hartshorne, in 

 Pepper's System of Medicine, is as follows : — 



I. — Only produced by contact or inoculation : — 

 Primary Syphilis, Vaccinia, 



Gonorrhoea, Hydrophobia. 



2. — Contagious also by atmospheric transmission through short 

 distances : — 



Variola, Scarlatina, 



Varioloid, Rotheln, 



Varicella, Mumps, 



Measles, Whooping Cough, 



Diphtheria, Typhus, 



Relapsing Fever. 

 3. — Endemic, occasionally epidemic : — 



Malarial Fever, Dengue, Yellow Fever. 



4. — The Zymotic or Enthetic diseases : — 



Influenza, Tropical Dysentery, 



Cerebrospinal Fever, Typhoid Fever, 



Erysipelas, Cholera, 



Puerperal Fever, Plague. 



It will be seen that a considerable proportion of the diseases 

 mentioned have not yet been proved by ocular evidence to be 

 due to any definite micro-organism; in fact, no such organism has 

 yet been accepted as the cause of our most common children's 

 ailments : measles, whooping cough, and even scarlet fever ; but 

 although no parasite may have been described and cultivated, 

 who can doubt but that all the diseases of this class, having the 

 characteristics of contagion, will some day be found to depend 

 upon a contagium vivum ? 



The influences of bacteria in the production of disease has, 

 then, been immense ; they have been at war with all living things, 

 and from the beginning of time they have been the most potent 



