534 



K. N. PAVLOVSKY AND E. J. ZAKIN 



of extract, i^'or iiistaiict", in experiment no. 35, 0-1 c.c. of extract 

 corresponds to one-twentieth part of the stomach of one bee, 

 and the quantity of ferment contained in this small particle 

 already evokes an alteration of the polarization plane to 



CuRvji 2. 



/ 2 



10 



25 cu cm of 

 tttrad from Iht mid- 

 gut of tbt bits 



Curve representing tlie uiflueiice of the quantity of invertase upon the 

 degree of inversion, according to the data obtained from the series of experi- 

 ments nos. 35 and 36 (see Table VI). 



0-ll°. This small experiment clearly exhibits the power of 

 activity of the invertase of the stomach of the bee. 



In the more perfect experiments, nos. 35, 36, it was established 

 that extracts added to sugar syrup in large quantities evoke 

 not an increase of inversion, but, on the contrary, its decrease 

 (nos. 35/, 35 y, and 36/, 36 </). 



This apparently uncommon phenomenon may be due either 



