PARASITOLOGY. 229 



colorless fluid which has a specific gravity of from 

 1005 to 1015, and contains from 1.5 to 2 per cent 

 solids, of which, .25 to .5 per cent is sugar, about one 

 per cent chloride of sodium, cholesteri.n, succinic 

 acid, creatin and traces of Hpase and proteids. As 

 the cyst wall contains glycogen it is probable that the 

 su-gar comes from this source. The walls also con- 

 tain chitin. 



Eosinophilia. — The chemic substance of the animal 

 parasites produce a positive chemotaxis. This affects 

 particularly the eosinophile leucocytes. There is a 

 local accumulation of the eosins in the tissues nearest 

 the parasite. In some insta^nces there is an increase 

 in the blood. These conditions have, particularly, 

 been noted in parasitism due to. species of the follow- 

 ing genera : Taenia, Filaria, Uncinaria, Ascaris, 

 Strongylus, Trichina and certain protozoa. The de- 

 gree of eosinophilia depends upon the degree of i:i- 

 festation. 



