DEPARTMENT OF BOTANICAL RESEARCH. 



63 



Two groups were chosen for the tests: succinic acid and its amino- 

 compound, amino-succinic or aspartic, which are dibasic, and its amide 

 as noted above, which is monobasic, and acetic acid and its amino- 

 compound, glycocoll, which are monobasic. Sections of plates of 

 agar, gelatine, agar-gelatine, agar-protein, and other mixtures w^ere 

 used. Swellings were carried out in the equable-temperature chambers 

 of the Coastal Laboratory at 16° to 17° C. A compilation of the 

 principal results is given in the following table : 



Hydration of agar, gelatine, agar-gelatine, and agar-oat protein in organic adds and 

 their amino-compounds at 16 to 17° C. 



[Expansion in percentages of dried thickness.] 



