FORMATION OF DEFENSIVE FERMENTS 



77 



purpose of studying the question, how long after the 

 actual parenteral introduction of cane sugar the 

 presence of invertin in the blood serum may be 

 demonstrated. After a single subcutaneous injection 

 of cane sugar the power of decomposing this di- 

 saccharide was still traceable at the end of fourteen 

 davs (curve I in fig. 6). In a dog, which received a 







FIG. 6. 



subcutaneous injection of cane sugar on two occa- 

 sions, it was still possible to bring about an energetic 

 splitting of this disaccharide with blood serum after 

 nineteen days (curve II in fig. 6). The property 

 once acquired does not therefore disappear at once. 

 The individual experiments were conducted with the 



