Wilson — Changes in Soils brought about by Heating. 

 The results are shown in Table I, and are plotted in fig. 1 (A). 

 Table I. 



515 



Determination of Electrical Conductivities. — The electrical conductivities 

 of the solutions were determined by means of the apparatus devised by 



Kohlrausch, and described by Ostwald (3). The liquid is placed in a 



N 

 Hamburger tube, and the instrument calibrated by means of an ^ 



solution of potassium chloride. 



4n 2 



