200 Veterinary Medicine. 



ture. On the second day the patient declines food, sits on its 

 breast or abdomeii, with head sunk between its wings, feathers 

 erect, eyes closed or semi-closed, and when raised it moves un- 

 steadily, or falls to one side, forward or backward. The comb 

 and wattles are now usually violet or black, and the droppings 

 still normal or slightly soft and green. The temperature varies 

 from io8° to 1 13° F. Drowsiness advances into coma, the patient 

 can no longer be roused, the breathing is stertorous or accom- 

 panied by audible plaints, and death usually occurs on the third 

 day, preceded by a marked fall of temperature (86° F.) and per- 

 haps spasms or paralysis. Some live only a few hours, others for 

 a week. 



Lesions. These are not very diagnostic. Local congestions 

 and blood extravasations may be diffused over the mucosae of the 

 alimentary canal and air passages, but the bowels rarely show 

 any such congestions or secretion as distinguish fowl cholera. 

 Petechiation and blood extravasation of the serosse, above all of the 

 pericardium, pleura, and peritoneum are more in evidence. The 

 lungs may show congestion and circumscribed areas of hepatiza- 

 tion. The liver is enlarged, and like the spleen and kidneys hy- 

 persemic or petechiated. Congestion and discoloration ~of the 

 lymph glands are common. Subcutaneous exudations are met 

 with. The localization of the lesions is however far from con- 

 stant, and it is their hsemorrhagic character rather than their 

 seat that is significant. 



Diagnosis. The features which distinguish chickenpest from 

 fowl cholera are mainly that chickens alone suffer, and particu- 

 larly that mature ducks and pigeons are immune ; that diarrhoea 

 is absent ; that there is no severe inflammation of the bowels, 

 though petechiae and blood extravasation may be present : and 

 that death follows more tardily — on the second to the fourth day 

 in place of on the first to the third. The failure to find the 

 bacillus cholercB gallineoe, or any definite microbe in all cases in 

 the blood is even more diagnostic. 



Medicinal treatment has been eminently unsatisfactory. 



Prevention may be sought by separating the sick and healthy, 

 disinfecting the poultry houses and yards, furnishing fresh runs 

 to the exclusion of the old ones, excluding from water-courses 

 which may be suspected of exposure to infection, exclusion of 



