light soils the particles forming the fraction called fine sand are much 

 finer though still larger than the lower limit of this fraction, viz. 

 0-02 millimetre. It seems somewhat anomalous that the coarser 

 material should be found in the less permeable soil. One is therefore 

 bound to conclude that the impermeability is brought about by the 

 presence of organic matter, as the small amount of clay (26 per cent) 

 could not well be responsible, when the surface soil, containing the 

 finer sand and more silt, is very permeable. 



TABLE VI. CHEMICAL ANALYSIS. 

 BY TWENTY-FOUR HOURS EXTRACTION WITH BOILING HYDROCHLORIC ACID. 



TABLE VII. PER CENT SALTS. 



From this table it will be noticed that the total amount of salts 

 docs not vary greatly throughout the three metres examined. The 

 proportion of sodium chloride to the total shows some slight difference. 

 This ;ij>|M>ars to indicate that some of the sodium chloride in the surface 

 one and half metres has been removed by the fresh water of the 

 annual overflow which takes some of the more soluble salts from 

 the surface layers of the soil. The greater part of the salt \vill be 

 left behind as the water evaporated. The fact that there is less salt 



