46 E. J. LUND 



3 4 5 6 7i 85 



Fig. 5. Experiment XXV. Curve A represents the course of extrusion of 

 Chinese ink by forty-eight individuals; curve B that of complete digestion of a 

 similar quantity of cold-ether extracted yolk by another set of forty-eight in- 

 dividuals from the same culture. 



had been eliminated; curve A does not therefore represent the actual 

 time at which the greater part of the ink was extruded but should have 

 its maxima farther to the left than shown. This statement applies to 

 all the extrusion curves which are given. 



In figure 5 curve B, is that of complete digestion; no extrusion 

 of the extracted yolk took place in this experiment. 



After it had been thus shown that ink fed alone to one set of 

 individuals was extruded long before digestion is completed of 

 a similar amount of extracted yolk fed to another set, experi- 

 ments were carried out to test what the reaction would be if 

 both ink and extracted yolk were fed to the same individuals 

 at the same time. The following two experiments are given to 

 bring out the facts in a quantitative way. 



Experiment XXVI. Fifty-four individuals were first fed Chinese ink 

 and immediately afterwards fed with cold-ether-extracted yolk. Two 

 individuals were placed in each watch-glass containing 5 cc. of tap 



