STRUCTURE AND DEVELOPMENT OF ECHINOCOCCUS 



353 



man or animals are transplanted into animals (rabbits). They develop 

 into echinococci and can then give rise to brood capsules and scolices. 

 As Deve further established, hydatid scolices are not capable of 

 developing in guinea-pigs, while corresponding experiments with 

 rabbits are in the large majority of cases successful where the scolices 

 are introduced subcutaneously or into the pleural or peritoneal cavities. 

 It is only in the case of daughter cysts that further growth is obtained 

 in the case of guinea-pigs. Finally it appears, as has been already 

 stated, that brood capsules can transform themselves into daughter 

 cysts, but according to Deve only within the mother cyst, not aftei 

 transplantation. Daughter cysts that have been formed in the mother 

 cyst of man and animals behave themselves just as the mother cyst 



does, i.e., they can remain sterile, 

 or give rise to brood capsules 

 and scolices, or even again 

 to fresh cysts granddaughter 



FIG. 257A. 



cysts. The mother cyst can also die, so that the daughter cysts then 

 lie in the cavity of the connective tissue capsule. The number of the 

 daughter cysts in either case may attain several thousands. 



The echinococcus fluid, which originally is formed from the blood of the host, is 

 light yellow, with a neutral or slightly acid reaction ; its specific gravity averages 1009 

 to 1015. It contains about 1-5 per cent, of inorganic salts, half of which is common 

 salt; in addition (besides water) it contains sugar, inosite, leucine, tyrosin, succinic 

 acid (associated with lime or soda) and albumens which are not coagulated by heat ;. 

 occasionally also the fluid has been found to contain hasmatoidin and uric acid salts 

 (in echinococcus of the kidneys), which doubtless demonstrates that the echinococcus 

 liquid originates from the host. It has been generally assumed that echinococcus 

 fluid contains a toxic substance the escape of which into the body cavity (at operation 

 or by bursting of a hydatid cyst) produces more or less severe symptoms (fever, 

 peritonitis, urticaria), so much so that one speaks of hydatid intoxication. The 



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