o.a 1,0 



1.2 ^- 

 J: 



/.e 1.4 1.6 1.8 2.0 2.2 



SCALE OF h^ IN Cm/sEC/v/cM 



0.8'^- 

 I 



^^^ 



MEAN CONDUCTIVITy (x^) VS. 

 COMPUTED MOBILITY (Hj.) 



MEAN IONIC CONTENT (n^)i/S. 

 COMPUTED MOBIL ITV (x^) 



0: 



a-ioo- 



40- 





(2. 



NUMBER OF OBSERVATIONS VS. 

 COMPUTED MOBILITY (x^) 



L-f- I 1 ! ^1 



Fig. 13. Variation in conductivity and ion content with computed mobility, 

 after conductivity recording began on cruise VII (September to Novem- 

 ber, 1929), using values of both positive and negative components; fre- 

 quency curve for mobility data at bottom 



172 



