462 Veterinary Medicine. 



scratching, etc. , will usually give a key to the degree of pruritus, 

 and handling the part will render the condition evident. 



7th. The history of the case is always important. Is it chronic 

 or acute? Continuous or intermittent? Associated with any 

 special conditions of proximity to other diseased animals, to 

 special feeding, watering, exposure, housing, harnessing, driving, 

 which might account for it ? Did there coincide with its erup- 

 tion any indigestion, gastric or intestinal, or any hepatic, urinary 

 or nervous disorder on which it might be dependent ? 



Prdgnosis. This is subordinate to the nature, causes, course, 

 duration and complications of the disease. 



Microbian dermatosis (variola, aphthous fever, rouget) 

 usually follows a rapid course and recovery is perfect with some 

 measure of immunity. 



Parasitic dermatosis (acariasis, phthiriasis), is liable to 

 have serious secondary results (infection to man or animals, loss 

 of wool, tender skin), and to run a chronic course. 



Maladies from externalirritants (chafing, caustics, traumas, 

 vegetable, or animal irritants), do not tend to chronicity and are 

 often promptly curable. 



Maladies due to ingested irritants (urticaria, distillery 

 waste eruptions), also tend to recovery when the source of irrita- 

 tion is cut off. 



Maladies due to toxic products of the system will be ob- 

 stinate or incurable, in ratio with the incurability of the causa- 

 tive factor. Those due to the absorbed products of a simple in- 

 digestion, will tend to terminate with the removal of the cause, 

 while those dependent on chronic and perhaps irremediable dis- 

 ease of the digestive organs, liver, or kidneys will be correspond- 

 ingly inveterate or incurable. 



Maladies due to a constitutional vice, in sanguification, 

 nutrition, innervation, etc., are likely to be irremovable or only 

 temporarily curable. 



Burns and some other skin diseases are liable to become 

 complicated by renal embolisms, albuminuria, indigestions, etc., 

 which may render the skin affection inveterate or incurable. 



Dermatitis on the folds of articulations or. on the seats of har- 

 ness, are sustained by the local irritation, and may necessitate 

 long rest, or abstention from work requiring the use of such 

 harness. 



