5 1 6 Redfern . — On the Course of Absorption and the Position of 
Table IV. Absorption of Methylene Blue , by Discs of Dead Carrot 
Tissue, from Solutions of Various Concentration. 
Duration of 
External concentra- 
Relative internal 
Weight of tissue 
experiment in hours. 
tion in per cent. 
concentration. 
in grm. 
0 
O-I 
0-0 
0.71 
24 
0-078 
0-022 
0.72 
48 
0.073 
0-027 
0.71 
96 
0.065 
0*035 
0-70 
0 
°*5 
0-0 
0-90 
24 
0-033 
0.017 
0-91 
48 
0.025 
0.025 
0-90 
72 
0-020 
0.030 
0-89 
0 
O-OI 
0-0 
o-73 
24 
O.OO73 
0.0027 
o-73 
48 
0-0052 
0.0048 
o-73 
72 
O.OO32 
0-6068 
o-73 
120 
0-002 2 
0.0078 
0.72 
0 
0-005 
0-0 
0.70 
24 
O.OO 37 
i o-oo 1 3 
0.76 
48 
0-0021 
0-0029 
o-75 
72 
0-0012 
0-0038 
o-75 
120 
0-0009 
0-0041 
0.74 
Fig. 3. The relation between final external and final internal concentrations in the case of 
living carrot tissue immersed in solutions of methylene blue. 
Similar results were obtained with methyl violet, though the proportion 
of dye absorbed by the tissue in this case was slightly less. The final 
external concentrations for both dyes are set out in Table V, and in Figi 6 
the logarithm of the final external concentration is plotted against the 
logarithm of the final internal concentration in the case of methylene blue. 
Table V. Absorption of Dye, by Dead Carrot Tissue , from Solutions 
of Various Concentrations . 
Original external ; Final external concentration in per cent . — 
concentration in per cent. Methylene blue. Methyl violet. 
0.1 0.065 0-065 
0.05 0.02 0-025 
o-oi 0.0022 0-003 
0*005 0.0009 0-0013 
