OF VETERINARY MEDICINE. 15 



result of the action of the cause. Tuberculosis is produced 

 by the multiplication of the bacillus of tuberculosis, and this 

 bacillus causes the disease ; caseation, cell-infiltration, and miliary 

 tubercles are the result of the germ action. 



Diagnosis. — To be able to diagnose is to succeed, either in 

 veterinary practice or in the human. Next comes logical reason- 

 ing power — to be able to put the symptoms together. The 

 veterinarian cannot, ask his patient anything, and he must arrive 

 at his own conclusions from what he sees. 



Hygiene. — This relates to diet, ventilation, drainage and 

 general management (housing, blanketing, feeding and exercise). 

 Seventy-five per cent of one's practice is produced by the bad 

 management by the owners of animals. 



CLASSIFICATION OF DISEASES. 



Diseases are divided into three classes, Epizootic, Enzootic, 

 and Sporadic. An epizootic disease attacks large numbers of 

 animals over a large tract of country ; there is no local cause. 

 Any specific disease may become epizootic, as influenza in horses. 

 An enzootic disease is due to a local cause and it may also attack 

 large numbers over a large tract of country. Specific diseases 

 are at times enzootic ; glanders might be or rabies. A sporadic 

 disease is one which occurs in single scattered cases without 

 specificity. Diseases of this kind are non-contagious diseases. 



THE BLOOD. 



Arterial blood is scarlet ; venous blood is blue ; dead blood is 

 black. Under the microscope blood is nearly colorless. It is 

 made up of water and salts and the red and white blood cor- 

 puscles. It also contains fibrin forming elements; fi*brin itself 

 does not appear in the circulating blood. The function of the 

 blood is to carry nutrition. If the circulation is disturbed a 

 disturbance of the nutrition will occur. Some parts of the body 

 suffer more from interrupted nutrition than others, the brain for 



