THE CONQUEST OF DISEASE 



Human 

 therapy 

 and animal 

 therapy. 



glanders, and tetanus. The animal industry 

 in the United States produces exports of over 

 two hundred and fifty million dollars. There 

 is invested in live stock, exclusive of poultry, 

 in this country a capital of four billion dollars. 

 From a commercial standpoint this itself is 

 well worth protecting. 



The progress in the making of antitoxins 

 and immunizing sera for the treatment and 

 prevention of infectious diseases in animals has 

 advanced much further than for the diseases of 

 man. This is because experiments for the ben- 

 efit of animals have been carried on with ani- 

 mals of the same families and species ; but for 

 the benefit of man, animals of other species 

 have had to be used. When an antitoxin for a 

 disease of the horse is made the horse is used in 

 its preparation; when an antitoxin for a dis- 

 ease in man is required we have to use the horse 

 or some other animal. And it is a well known 

 fact in experimental physiology that the living 

 tissues and fluids of animals are poorly inter- 

 changeable from one species to another. That 

 is the reason why at this early period in the his- 

 tory of serum therapy the cure of infective dis- 

 eases in animals has advanced farther than the 

 cure of the infective diseases in man. 



140 



