132 ENTOZOA FOUND IN MAN. 



neutral or slightly alkaline. It is not coagulable by 

 heat nor by acids. 



The atheromatous substance found in old hydatid 

 cysts is composed principally of phosphate of lime, 

 and of an animal matter similar to albumen ; it also 

 contains a small quantity of carbonate of lime, of 

 cholesterine, and other fatty matters. The presence 

 of cholesterine in the cysts which have become 

 atheromatous is probably general. 



Other substances, the presence of some of which 

 is accidental, are also occasionally found in hydatid 

 cysts. These are hoematin, sugar, and some of the 

 urinary salts. 



All of the tumours in which the colouring 

 principle of the blood (hoematin) has been ob- 

 served, have occurred in the liver ; and it is 

 in the fluid contents of tumours in this situation 

 that the existence of sugar has been noted. The 

 urinary salts were found in some hydatid cysts which 

 were voided with the urine ; they consisted of the 

 crystals of uric acid, oxalate of lime, and phosphate 

 of soda, and their presence was attributed by Mr. 

 Quekett, who examined the cysts, to the penetration 

 of the urine tiirough the walls of the cysts by 

 endosmosis.^ 



^ Cruveilhier has readily shown the permeability of hydatids, 

 by placing them in ink. The liquid which they contain soon 

 becomes blue, and then black. 



