H. J. KOCH 



O 20 MINUTES SO SO 100 120 



Figure 3. Influence of the action of different basic 

 dyes [at io -3 m) on the absorption of NaClfrom an 

 8 mu. JVaCl solution (as determined by conductivity) . 

 The dyes are added at -f- and washed away at — . 

 (After Koch, Evans and Schicks, 1953, corrected 

 scale.) 

 P C: pyocyanine ; MB: methylene blue; L V: thionine. 



30- 



20 _ 



10 _ 



P<0.O1 P<0.01 P<0.O1 



Figure 4. Influence of different basic dyes on the jVfl absorption 

 by the anal papillae of the larvae q/"Chironomus plumosus. 

 The relative amounts of Na absorbed after the same time are 

 expressed on the basis of activity per milligram fresh tissue 

 per 10 minutes. (Koch, Evans and Schicks, 1954&.) 



18 



