5(17 



Gouflning the auiiiials to frequently tlushed artificial 

 tanks will, howevei-, prevent lapeworni infection. 



Witli cliickens, the outlook is somewhat better. An 

 exteiinination of slugs will insure immunity against 

 Davainca proglottina, but no precise directions can be 

 given to prevent cliickens from becoming infested 

 with olhcr tapeworms until the life history of these 

 parasites is better understood. It will be well, how 

 ever, to keep chickens housed in the morning until tlic 

 sun is well up and the ground is drj-, for they will lliiis 

 be less likely to meet witli the supposable intcruiiMlialc 

 hosts of other worms. 



Absolutely nothing can be done at jncsent looking 

 to a prevention of the transmission of tapeworms of 

 wild bii'ds to the domesticated fowls through known or 

 unknown intermediate hosts, except to prevent the 

 domesticated ducks, geeso. etc., from visiting ponds. 



There is, however, considerable outlook for improve 

 inent if different kinds of fowls are alternated in sue 

 ceeding years upon the same ground or if the runs and 

 yards of fowls are occasionallj' changed. From the 

 table (pp. 554, 555), it will be seen that thus far none of 

 Uie tapewoiins of chickens are known to occur in lur 

 keys. Whelher this immunity of chickens to turkey 

 worms and turkeys to chicken woi'ms is real or appar 

 eiit, liowcvcr, is yet to be scientifically determined. 

 Should if ])rove to be real, then an alteration of flocks 

 (if turkeys and chickens in different years will probably 

 insure practical immunity of both birds from any seri 

 ous outbrealvs of tapeworm disease. If, however, tui- 

 kej'sorchickcns.as the case may be, are raised upon the 

 same grounds year after year, it is only natural that 

 those grounds should become thoroughly infested with 

 the larval stages of tapeworms and that fresh out- 



