96 SOILS 



into the chimney very firmly; it may suggest the 

 value of rolling. 



The chimney of soil is a field in miniature; all 

 fertile soils draw up water from the water table by 

 capillary action, as these samples of soil draw up 

 water from the pan. One of the most important 

 functions of the soil is here exemplified. Some- 

 times simple experiments like these show in tang- 

 ible, concrete form, the results that may be expected 

 from a farm practice that must be extended over a 

 number of years in order to achieve these same 

 results in the field. 



