water because the measurements in this case are very difficult to per- 

 form accurately, and the values found 32, 16, and 24 do not differ 

 far beyond the possible errors. 



3456789 

 PER CENT or FRUCTOSE 



10 II 



FIG. 2. The action of fructose in protecting invertase from destruction by acid. 



These results on the protection of invertase by fructose indicate 

 that the enzym forms a combination with the sugar which is more 

 resistant to the destructive action of acids, alkalis, hot water, and 

 alcohol than is invertase itself. They also open up a way in which 

 this compound can be investigated. 



[Cir. 59] 



O 



