CONDUCTIVITY AND PERMEABILITY 207 



tissue in distilled water and observing the increase in 

 conductance of the latter. The results are shown in Fig. 

 91, in which the ordinates denote the amount of exosmosis. 

 It will be seen that there is more exosmosis from tissue 



FIG. 90. The ordinates denote the rate of diffusion of NaCl, CaCla and sea water through 



living tissue of Laminaria. NaCl diffuses more rapidly than sea water, while CaCh at first 



diffuses more slowly, then more rapidly than sea water. 



which has been previously treated with NaCl 0.22 M than 

 from tissue treated with a balanced solution. 12 



Tissue treated with CaCU 0.17 M showed less exos- 

 mosis than that treated with the balanced solution. 13 



These results are also in harmony with the experi- 

 ments on electrical conductivity. 



12 For exosmosis of pigments of Rhodymenia in relation to electrical 

 resistance see Osterhout (1919, C). 



13 The concentrations of NaCl, CaCl, and of the balanced solution were 

 chosen so as to be approximately isotonic with the tissue. 



