BY E. H. GURNEY. 17 



unsolved, the different means of maintaining the fertihty 

 of most soils are, in a general way, known. 



But before any system of soil management can be 

 adopted in connection with the maintenance of soil fertihty 

 the characteristics and particular requirements of the soil 

 to be treated have to be considered. And this being the 

 case, the value of the knowledge gained of the different 

 soil types in a country by means of soil survey work cannot 

 be over estimated. 



In conclusion it is desired to state, that as time goes 

 on measures for obtaining permanent fertility of the soil 

 will be required, and soil study will always form an import- 

 ant subject of scientific investigation. 



