Selective Permeability. 375 



Table II. — Seeds in Phenol Solutions of Various Strengths. 



Strength of phenol 

 outside seeds. 



Gain in 

 weight of 

 5 grm. seeds 

 after 2 days. 



YvPlcnt". nf 



If CigllU UI 



phenol 

 inside seeds. 



Weight 

 of water 

 inside 

 seeds. 



Strength of 

 solution inside 

 seeds. 



Eatio of 

 strength 

 solution 

 inside 

 to strength 

 solution 

 outside. 





grm. 



grm. 



grm. 



1 V "9 CfVVTl T1PT* 





1^/2 Ct "Of) frm Tier 



3 '321 



"485 



2 '836 



3 - 4 



100 grm. water) 









100 grm. water 





N/4 (2 - 50 grm. per 



3-081 



0-243 



2-838 



8 "6 grm. per 



3-4 



100 grm. water) 









100 grm. water 





N/8 (1 -24 grm. per 



3-024 



0-129 



2-895 



4 -45 grm. per 



3-5 



100 grm. water) 









100 grm. water 





N/16 (0 -64 grm. per 



3-205 



-057 



3-148 



1 "81 grm. per 



2-9 



100 grm. water) 









100 grm. water 





for the hydrolysis. The accuracy of the method was tested in the same 

 way as in the case of aniline and phenol, and the error found to be within 

 5 per cent. 



Table III. — Seeds in Acetic Acid Solutions of Various Concentrations. 



Strength of outside 

 solution x per cent, 

 acetic acid to (100 — x) 

 per cent, water. 



Grain in weight 

 of 5 grm. seeds after 

 2 days. 



» 



Strength of solution 

 inside seeds. 



Eatio of strength 

 solution inside 

 to strength solution 

 outside. 





grm. 



per cent. 









2-640 







10 



2 -643 



8-1 



-81 



20 



2-816 



27 -0 



1 35 



30 



3 -028 



38 -3 



1 27 



40 



3 -037 



53 -4 



1 -33 



50 



2 -974 



80 -1 



1 -60 



60 



3-052 



80 -0 



1 33 



70 



2 -862 



81 -8 



1 17 



80 



2 -590 



82 -5 



1 -03 



90 



2 -164 



80 -0 



0-89 



100 



040 







The graphical relation between the strength of the solution inside the 

 seeds and that outside is shown in Diagram I. It will be seen that for all 

 outside solutions stronger than 50 per cent., the strength of the adsorbed 

 solution inside the seeds is constant at 80 per cent. Apparently the col- 

 loidal contents of the seeds cannot take up acetic acid unless at least 20 per 

 cent, of water diffuses with the acid also. A striking confirmation of this 

 is found in the absorption curve for water-acetic acid mixtures. Table IV 



VOL. LXXXIX. — B. 2 H 



