EXPERIMENTS WITH TAPEWORMS. 



309 



when about to die will sometimes evert the scolex under un- 

 favorable conditions. 



TABLE I. 



To SHOW THE RESULTS OF AN EXPERIMENT MADE TO DETERMINE THE EFFECTS 

 OF CERTAIN SOLUTIONS UPON THE PROCESS OF EVAGINATION. ALL MATERIAL 

 WAS KEPT IN A WATERBATH AT ABOUT 37^ C. In lots 9, 10 and n the solutions 

 were changed after four hours and fifty minutes. 



A study of the table shows the following special results: Lot I 

 verifies previous observations, though the salt solution is here 

 raised to body temperature. Therefore, we may conclude that 

 temperature alone appears to have no important influence in 

 producing evagination. From lots 2 and 3 it is also clear that hy- 

 drochloric acid interferes with or at least does not help eversion. 

 The pepsin solution slightly aids the process as shown by a com- 

 parison of lots 4, 5, and n. The pancreatin solution is a more 

 favorable medium (lot 7). However, preceding a pancreatin 

 solution by a pepsin solution does not seem to increase the 



