TREMATODA 55 



It is obvious that infection can only occur from swallowing free 

 cercariae or freshwater mollusks which contain the higher larval 

 forms in their encysted or pupa condition. Slow running 

 streams or stagnant pools with sedgy banks are eminently 

 favorable to the existence and multiplication of intermediary 

 bearers, and consequently their waters are dangerous if 

 employed for drinking purposes. 



BIBLIOGRAPHY (No. 12). Bilharz, in Siebold and Koll., 

 'Zeitsch. fiir wissensch. Zool./ iv, 1851. Idem, ' Wiener 

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 'Proceed. Linn. Soc./ vol. v, Zool. Div., p. 31, 1860. Idem, 

 " Remarks on Dr J. Harley's Distoma capense," in ' Lancet/ also 

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 repr. in the 'Veterinarian/ 1872. Idem, 'New Entozootic 

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 in Gunther's 'Record of Zool. Literature,' p. 617, 1865. Idem, 

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 Health, iu 'Med. Times and Gazette/ Jan., 1871, repr. in the 

 'Veterinarian/ p. 359, 1871. Idem, "Verification of recent 

 Hasmatozoal Discoveries in Australia and Egypt," ' Brit. Med. 

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 rinarian' for May, 1871. Davaine, C., 1. c., ' Synops/ and p. 312, 

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 of the Cape of Good Hope, produced by a Distoma/ rep. in 

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