iff 



of the soil mixtures. Similar results were obtained 

 h all soils used and it seemed useless, therefore, 

 to examine or define the soils in detail. The admixture 

 of more or less sand with the loam served, in connection 

 with the mercury column of the auto-irrigator ,to regulate 

 the water content of the soil. The heavier (less sandy) 

 mixtures were used for the more water-loving plants. 

 It will he remembered that the capillary tension, and 

 hence the water content held against the auto-irrogator , 

 is greater the finer the particles of the soil. 



