GENERAL PART OF EXAMINATION. 63 



Hepatogenous icterus is seen in duodenal catarrhs with 

 swelling and mucous obstruction of the ductus cholcdochus, 

 tumors, parasites (ascarides) and concretions which block 

 the bile flow. In lupinosis and phosphorous poisoning a swell- 

 ing of the ducts and parenchyma of the liver occurs leading to 

 the collection and absorption of bile. 



Malignant icterus (icterus gravis) has associated with it 

 mental depression and slow heart's action due to the effect of 

 the cholic and other acids contained in bile. 



III. Swelling. Swellings of the conjunctiva usually 

 are diffuse and may occur in both eyes. They are due to a 

 serous infiltration of the mucosa and submucosa. If of an 

 inflammatory character they are hot and painful. This con- 

 dition finds its best development in influenza of the horse, 

 the greatly swollen, glassy mucous membrane protruding from 

 between the half-closed lids. It is seen further in contagious 

 pleuropneumonia of the horse, purpura hemorrhagica, ma- 

 lignant head catarrh of the ox, Rinderpest, anthrax, clog dis- 

 temper, chicken diphtheritis and strangles. 



The swelling may be due to hydremia, as in primary 

 anemia and in cachectic diseases of sheep : liver fluke disease, 

 lung and stomach worm plague. 



In the course of chronic diseases of the stomach and in- 

 testines a slight swelling of the conjunctiva, attended with a 

 washed-muddy and sometimes icteric discoloration, appears. 



The conjunctiva may be drier than normal in seveie feb- 

 rile diseases and bad colics. 



5. Bodily Temperature. 



The internal temperature of the body is maintained, with slight 

 variation, at a definite elevation by means of an especial regulating 

 apparatus. The production of heat in the body and the loss of heat 

 from the body are kept equal. If the temperature varies from the 

 normal, and this variation be preserved for a time, a disturbance due 

 to disease is affecting the regulatory apparatus. 



