THE SOIL 



329 



closing one end with muslin, as in Fig. 214. Tap the tubes 

 several times until the soil has settled down ; then put the 

 closed end into water, and note the rate at which the 

 water rises, marking each period with a strip of gummed 



I. 3. 4. 5. 



J 

 5 

 10 

 15 

 20 

 25 

 50 

 55 

 40 

 45 

 50 



55 



60 

 65 



TO 

 75 

 80 

 85 



90 

 9b 



100 



Fig. 216. Diagram showing 

 Amount of Water absorbed 

 by the Soils in Experiment 

 Fig. 214. 1, surface soil; 2, 

 clay ; 3, subsoil; 4, bracken peat; 

 S, sand. 



n 





z*y 







Fig. 217. Experiment to 

 determine the Rate of 

 Percolation in the Soil. 



paper. Sow ten mustard seeds at the top of each tube of 

 soil and note when they germinate and how they grow in 

 the different soils. 



Does the water rise at an equal rate in each tube ? In 

 which case does it rise highest ? How does the proportion 



