494 Mr. W. Stiles and Dr. F. Kidd. The Comparative 



7001 — 



- 100 



10 20 30 40 



Time ih hours 



Fig. 4. — Potato in Solutions of various Sulphates of Concentration N/50. 



nitrate the initial absorption is soon masked by exosmosis. The actual 

 changes in conductivity observed are given in Table VI, and are shown 

 graphically in fig. 5. 



Table VI. — Carrot in Solutions of various Mtrates of Concentration N/50. 



Time in 

 hours. 



Changes in conduetivifcy of solutions. 



Potassium 

 nitrate. 



Sodium 

 nitrate. 



Calcium 

 nitrate. 



Zinc nitrate. 



Aluminium 

 nitrate. 



-5 

 19 -25 

 71 -.W 



- 183 



- 891 

 -2023 



- 89 



- 659 

 -1360 



- 86 

 -215 

 -493 



- 57 

 + 107 

 + 540 



- 20 

 -135 

 -268 



The relation of the initial absorption to the ionic mobilities and coefficients 

 of diffusion is again suggested. 



The subsequent decline ia the rate of absorption of the calcium salt 

 relative to the potassium and sodium is also in evidence. The toxic action of 

 zinc is once more shown both by the subsequent rise in conductivity of the 



