COLLOIDAL BEHAVIOR OF PLANT PROTOPLASM. 161 



TABLE V. 



Water. 



GlycocoU o.oi M. 



Glycocoll Ester 

 O.OI M. 



Glycocoll Ester Hy- 

 drochloride O.OI yi/. 



Glycocoll Hydro- 

 chloride O.OI I\I, 



Agar. 

 Sections 0.15 inm. Thick at 15° C. 



3,220 



4.130 



3.360 



1.530 



1,000 



(Increases in width and length very slight.) 



Gelatine. 

 Sections 0.23 mm. Thick at 15° C. 



The above data reduced to terms of swelling in water as 100 

 give values as in Table VI. 



TABLE VI. 

 Swelling of Dried Plates of Agar and Gelatine. 



Water. 



Glycocol 



Glycocoll Ester. 



Glycocoll Ester 

 Hydrochloride. 



Glycocoll Hydro- 

 chloride. 



Agar. 



100 



128.30 



104-35 



47-50 



31-07 



Gelatine. 



Glycocoll and its ester are seen to increase the swelling of agar 

 and to lessen that of gelatine. The two salts exert the classical 

 effects of retarding the swelling of agar. The swelling of gelatine 

 in the glycocoll estes hydrochloride is slightly less than in water, 

 while the swelhng of gelatine in the glycocoll ester hydrochloride is 

 higher as in an acid solution. 



Hydration of Agar in Solutions of Various Hydroxides. 



The delicacy of reaction prevailing in the behavior of agar 

 towards hydrogen and hydroxy! ions as well as various cations is 



