518 



Scientific Proceedings, Royal Dublin Society. 



In the previous set of experimeuts it seemed possible tliat the extract iti 

 each case did not contain a fair sample of the soluble soil constituents, 

 owing to the fact that tlie water had passed througli definite channels in the 

 soil, leaving a large portion of the sample untouched. 



The soil was placed in beakers, containing about 115 gms., and heated at a 

 constant temperature for not less than two hours. The extract was obtained 

 by pouring 100 c.c. of distilled water on the sample, which had been allowed 

 to cool during twenty-four hours. The soil was then stirred up and set 

 aside for a further period of twenty-four hours, during which it was 

 frequently stirred. The mixture of soil and water was then filtered, and the 

 brownish extract obtained as before. A few drops of toluene were added to 

 each extract. 



The depression of freezing-point and conductivity of each extract were 

 determined as before, and the depression due to electrolytes calculated. The 

 results are shown in Table IV and Fig. 3. Several experiments were made 

 at the lower temperatures. 



Table IV. 



