EXPERIMENT STATION BULLETINS. 



583 



In the second or present investigation the effect of repeated freezing 

 upon the lowering of the freezing point has been also reinvestigated, at 

 this time more thoroughly and systematically and with more uniform 

 procedure. The procedure consisted of determining the depression of 

 soils at a very low moisture content in the usual way, and then placing 

 the soil sample, without disturbing it, in a cooling mixture having a 

 temperature of about — 12 °C, and allowing it to remain there for one 

 hour. The sample then was taken out of the cooling bath, thawed by 

 holding that portion of the tube containing the soil between the hands, 

 and then determining the freezing-point depression again. Table 10 

 contains the results obtained by this procedure with only a few of the 

 typical soils that were employed. 



Table 10. Effect of Repeated Freezing upon the Lowering of the Freezing Point. 



