91 



500 



of these compounds would fix respectively — — = 6,7 cm' 



75 



and 



500 



^= 5,6 cm'\ N. alkali, so the agreement is sufficient. 



On the other hand amino acetic acid and rt-aminopropionic acid 

 behave in hydrochloric acid containing solution as monacidic alkali, 

 so that these aminoacids slacken the velocity of inversion of sucrose 

 by hydrochloric acid considerably (Table III). 



TABLE III. Slackeaing influence of glycine and alanine on the inversion of sucrose by hydro- 

 chloric acid. 



As follows from the survey given in table III the protective 

 action of glycine and alanine on sucrose corresponds with respec- 

 tively ± 6 cm^ and ± 5 cm\ N.HCl. 



It is thus proved that under the circumstances of these experi- 

 ments both aminoacids behave as monacidic basic substances. 



