AMONG SCHOOL GARDENS 



into use, and the greater part of that due to 

 rains or heavy dews can be preserved. Two 

 simple experiments will determine approximately 

 the moisture conditions of the proposed garden. 

 The illustration shows the apparatus, a set of 

 chimneys in a rack, their lower openings covered 

 with cheese-cloth. Soils of different textures 



kaw 



Device for Experiments with Soil 



are placed to the same height in the chimneys. 

 The porosity of different soils is shown by the 

 rapidity with which the same amount of water 

 poured in each chimney passes through its con- 

 tents, and their power of absorption by the amount 

 absorbed in passing. The capillarity of the soil 

 may be shown by reversing the experiment, and 



98 



