DISEASES OF THE LIVER. 251 



LARDACEOUS LIVER.— Lardaceous degeneration of 

 the liver is sometimes met with after death, but there are 

 no clinical symptoms by which it may be positively diagnosed 

 during life. 



The characters and appearances presented by lardaceous 

 degeneration of the various organs of the body has already 

 been described (page 31). When involving the liver, the 

 conversion of the albuminous substances into lardacein 

 usually commences in the middle zone of the lobides, cor- 

 responding with the distribution of the hepatic artery. 



Lardaceous degeneration of the liver is often accompanied 

 by similar changes in other abdominal organs, and is 

 attended by general impairment of health and progressive 

 loss of flesh. 



HYDATID TUMOURS AND OTHER MORBID 

 GROWTHS OF THE LIVER. 



Hydatid Tumours.— Hydatid tumours (vdanc, a vesicle) 

 are usually due to the development of the cysticercal embryo 

 of the Tsenia Echinococcus of dogs. 



They are not of common occurrence in the horse, though 

 the liver is perhaps more frequently their seat than any 

 other organ. 



The relationship between a cysticercus and its fully de- 

 veloped mature tapeworm is described in the Chapter on 

 Animal Parasites, to which the reader is referred for the 

 full history. 



A hydatid tumour consists of a primary sac or bladder, 

 with thick, soft, transparent, and laminated walls, the 

 innermost layer of which is formed by a delicate cellular 

 membrane. The sac (mother-cyst) is filled with clear, 

 limpid fluid, in which are numerous daughter-cysts. On 

 the inner surface of these secondary cysts there are situated 

 many little prominences, which consist of small vesicular 



