FOREIGN BODIES INJURING THE HEART. 409 



common to both forms; the same may be said of the sub- 

 sultus and palpitation. The only certain differential symp- 

 toms are the peculiar character of the sounds and the eructa- 

 tions. In simple pericarditis the gurgling sound is heard 

 with extreme difficulty ; in that caused by a strange body, on 

 the other hand, it is easily heard, rather deserving the name 

 of rushing than gurgling, the noise being likened to the 

 plunging of butter in a churn. This is supposed to arise 

 from the greater consistence of the liquid, and its admixture 

 with gas. When the noise is feeble, causing the animal to 

 walk a few steps will make it very distinct. 



It is suggested that the eructations are from the free com- 

 munication between the pericardium and the stomach, allow- 

 ing the gas formed in the former to pass into the latter and 

 thence into the mouth. This would seem to be supported 

 by the circumstance, that in the second case mentioned there 

 was no such communication, and eructations also were 

 wanting. Also in simple pericarditis there are no marked 

 eructations. This, with the comparative rarity of the last- 

 named malady, makes error also much less common. 



By attention to the above-mentioned diagnostic symptoms, 

 M. Boizy states, that the presence of a foreign body may be 

 diagnosed with great certainty. 



DISEASES OF THE ARTERIES. EMBOLISM. 



One of the most remarkable diseases to which man and 

 the lower animals are subject is 'Embolism/ or plugging of 

 arteries. I have seen several cases of this description in the 

 horse, and several observers, but especially Hertwig, Dela- 

 fond, Bouley, and Barlow, have recorded instances. The 

 disease, consisting in distention of arteries by solid coagulated 

 lymph, first received the name of arteritis. It has been 

 better studied, especially by human physicians, and termed 



