110 BOVINE PATHOLOGY. 



nature of tlie disease, suggests eggs and milk, and in 

 addition to this highly albuminous food, stimulants and 

 chlorate of potash. 



Scarlatina has been described by Professor Barlow. 

 It is very similar to the disease next described, but differs 

 in the less marked swelling and in the spotted character 

 of the mucous membrane which is covered with red points, 

 and altogether has a scarlet colour differing from the 

 ecchymoses and blood infiltrations of purpura. There is 

 also, generally, sore throat. 



PuEPURA HEMORRHAGICA. — Urticaria tuherosa (Simonds) ? 

 is described as affecting cattle, though certainly it is not 

 so frequent in them as in the horse. Calves are deemed 

 most liable to this disease which consists in a disordered 

 condition of the blood. That fluid is thin and so related 

 to the blood-vessels that extravasations occur especially 

 on the mucous and serous membranes. Swellings appear 

 on various parts of the body which are hot and painful 

 and somewhat sharply circumscribed. From them and 

 from the nostrils flows a reddish fluid. The animal is 

 extremely debilitated. The swellings of the mucous 

 membrane obstruct respiration and deglutition. The 

 depraved state of the blood causes a weak and fluttering 

 action of the heart, and a small dicrotous pulse. Petechiae 

 and blood extravasations on the mucous membranes are 

 pathognomonic. Undoubtedly these conditions may arise 

 from several pathological states, which interfere with the 

 relations of the blood with the vessels which contain it. 

 It is not essential that capillary ruptures should take 

 place in production of petechiae and extravasations of red 

 corpuscles. A slight migration of these bodies occurs in 

 health (diapedesis), but doubtless in most cases of purpura 

 there is a true giving way of the walls of the capillaries. 

 By some authorities purpura is considered anthracoid in 

 its nature. This is not the place to minutely discuss the 

 various pathological theories of purpura; the disease 

 follows debilitating influences, as previous disease, exposure, 

 and inhalation of foul air. 



Autojysy shows petechiae of serous and of deeply-seated 



