446 



CHAPTER XXII. 



General Diseases. 



general remarks simple fever stable fever influenza 



conta&ious pleubo - pneumonia strangles ^anthrax south 



african horse sickness ^fobt pirib horse disease cbbbbbo- 



spjnal pbver glanders and fabct ^epizootic lymphangitis 



ulcerative lymphangitis ^whbd — tubbrcclosis horse-pox 



diabetes mellitus diabetes insipidus purpura asmob- 



rhagica hemoglobinuria ^eheumatism rabies tetanus 



blood - poisoning navel - string infection protozoal 



diseases malarial fever ^piroplasmosis, biliary fever or 



tick fbver trypanosomiasis surra tsetse fly disease 



DOURINE. 



General Remarks. 



It may be saiely concluded that all the general diseases of an 

 in/ective nature, are caused by the entrance into the system of 

 minute vegetable or animal organisms. As a rule, the vegetable 

 organisms are bacteria (pp. 19 and 63) ; and the animal ones, 

 parasites which live in the blood (haematozoa). The specific parts 

 played by different kinds of bacteria are of great variety. Some 

 bacteria produce colour, as, for instance, a blue tinge in milk ; 

 others, light, as seen by the phosphorescence produced by the 

 photo-bacterium phosphorescens during the fermentation of sugar, 

 under certain conditions. They are the causes of fermentation 

 and putrefaction, and, in many cases, of disease. Various kinds 

 of fermentation-producing bacteria are essential to the proper 

 performance of digestion. In plant life, bacteria are the means 

 by which lucerne and many other vegetables absorb nitrogen from 

 the air. Sir Patrick Manson (Gibson's " Text-book of Medicine ") 

 states that disease-producing organisms elaborate poisonous sub- 

 stances, which call forth certain symptoms, of which some are 

 specific, and belong exclusively to a particular species, while others 



