78 FORMATION OF DEFENSIVE FERMENTS 



following quantities of serum and cane sugar 

 solution :- 



(1) 0*5 c.c. serum (blood taken fourteen days after 



injection of cane sugar). 



o'5 c.c. of a 10 per cent, solution of cane sugar. 

 7 c.c. normal salt solution. 



(2) 0*5 c.c. serum (blood taken nineteen days after 



the second injection of cane sugar). 

 0*5 c.c. of a 10 per cent, solution of cane sugar. 

 7 c.c. normal salt solution. 



Control Test. 



A and B. 0*5 c.c. serum. 



7'5 c.c. normal salt solution. 



These results, without our knowing it, confirmed 

 experiments which Weinland had made before us. 

 He had already been able to show that the blood 

 plasma of a dog is able to split up cane sugar; 

 that is to sav, it contains invertin as soon as cane 



mf ' 



sugar is parenterally introduced. These experi- 

 ments were then later extended to other kinds of 

 sugar, and especially to milk sugar. It was pos- 

 sible to show that the latter also undergoes alteration, 

 but it seems that here, alongside of a hydrolysis, a 

 decomposition takes place in another direction. 



Very extraordinary is the observation that, after the 

 introduction of soluble starch, and also of milk su^ar, 



<T^ 



the blood plasma or serum is able to decompose 



