496 Mr, W. Stiles and Dr. F. Kidd. Tlie Comparative 



Table VII. — Potato in Solutions of various Mtrates of Concentration N/50. 



Potaasium 

 nitrate. 



Sodium nitrate. 



Calcium nitrate. 



Zinc nitrate. 



Aluminium 

 nitrate. 



Time 



in 

 hours. 



Change 

 in 



electrical 



con- 

 ductivity. 



Time 



in 

 hours. 



Change 

 in 



electrical 



con- 

 ductivity. 



Time 



in 

 hours. 



Change 

 in 



electrical 



con- 

 ductivity. 



Time 



ih 

 hours. 



Change 

 in 



electrical 



con- 

 ductivity. 



Time 



in 

 hours. 



Change 

 in 



electrical 



con- 

 ductivity. 



0-75 

 14 -12 

 20 -70 

 42-45 



-67 

 -95 

 -44 

 + 67 



0-75 

 13 -97 



41-77 



- 7 

 + 4 



+ 285 



0-45 

 14 -0 

 20 -18 

 42-18 



- 6 



+ 60 

 + 127 

 + 382 



0-75 

 14-10 



41 -93 



- 27 

 + 23 



+ 210 



0-45 

 13 -50 

 19-35 

 42 -5 







-141 

 -155 

 -181 



400 



200 



u 10 '0 30 *o 



TIME JN HOURS 



Fig. 6. — Potato in Solutions of various Nitrates of Concentration N/50. 



measured decreases in conductivity should give approximate values for the 

 intake of the anions. 



The results obtained with carrot are shown in Table VIII and fig. 7. 



These salts therefore produce the expected result. It will be observed 

 that the original order of apparent absorption is potassium sulphate, potas- 

 sium nitrate, and potassium chloride. 



Nevertheless, the slowing down of the absorption from the sulphate 

 solution due to the much smaller final absorption of sulphate (cf. the series 

 with sulphates) later alters the order to potassium nitrate, potassium 

 -chloride, and potassium sulphate. 



