308 PROPERTIES OF AMINO-ACIDS AND PEPTIDES 



SUMMARY. 



The titration curves of solutions of glycine, alanine, a:-amino-buty- 

 ric acid, leucine, glycyl-glycine, alanyl-glycine, alanyl-alanine, ace- 

 tone, acetamide, urea, acetic acid, and aceturic acid were determined 

 and some of the relations as dependent upon the chemical structures 

 discussed. 



The isoelectric points of some of the amphoteric electrolytes were 

 found experimentally. The definition of isoelectric point, its theoreti- 

 cal significance, and method of calculation were considered in some 

 detail. 



