204 F, G. Camion 



Cercariae from Ph^sopsis added to solution of 1 grs. of fresh 

 lime to 10 c.c. of water. All cercariae killed instanteously 

 and globules seen throughout them. 



Cercariae from Physopsis added to a solution of 10 gr. of 

 fresh lime in 40 c.c. of water. About 1 in 10 of the cercariae 

 still alive at the end of an hour. 



Cercariae from Ph^sopsis added to a solution of 10 grs. of 

 old lime to 20 c.c. of water. All cercariae still active after 

 half an hour. 



These experiments were made with typical Bilharzia cercariae 

 on January 19th. 



Head of cercaria, : 1 75 mm. , tail, : 2625 ; prongs, : 0875. 

 Total length, : 425 m.m. 



On March 30th a solution of gr. 1 Antimoniura Tartrate ta 

 4 c.c. distilled water was added to some mature Bilharzia cer- 

 cariae. Nearly every one was dead within a quarter of an hour. 



These investigations have been carried out under the auspices 

 of the Streatfield Research Trust. 



