452 Mr. W. Stiles and Dr. E. Kidd. Position of the 



Table III. — Carrot in Calcium Chloride of different Concentrations. 



Time in 

 hours. 



Change in electrical conductiyity of external solution. 



Distilled 

 water. 



N/5000. 



N/500. 



N/50. 



N/10. 



0-5 

 14 -5 

 20-5 

 36 -25 

 42 -5 



+ 64 

 + 86 

 + 60 

 + 54 



+ 35 

 + 53 

 + 17 



+ 3 



- 53 



- 57 

 -105 

 -116 



- 71 

 -145 



-125 

 -181 

 -195 



-343 

 -457 

 -370 

 -503 

 -470 



10 20 30 40 50 10 20 30 40 50 10 20 30 40 



TIME IN HOURS 



Fig. 1. — Changes in concentration of the external solution wjien carrot tissue is immersed 

 in various chlorides of different concentrations. 



We may note, then, first, that in all cases a decided absorption of salt 

 takes place, and secondly, that the amoujits of absorption increase along with 

 increasing concentrations of salt in the exterior solutions. Thirdly, the rate 

 of absorption is actually very slow at the temperatures used. In the case, 

 for example, of the stronger concentrations of sodium and potassium chloride 

 (N/50 and N/IO) absorption is obviously not complete at the end of 48 hours. 

 It is to be borne in mind that the discs are only 1 mm. thick. We shall 

 return to this point later, in dealing with earlier work. Lastly, it is to be 



