EXPERIMENTS AND PRACTICAL WORK 65 



Expt. 116. Methods of Tillage. 



(a) Preparation of Bed, In the School Garden prepare 

 a thoroughly loosened and well-forked bed. 



(b) Cultivation. Loosen the soil around a growing 

 plant without injury to the roots. 



(c) Earth Mulch. Keep the surface of the beds in the 

 School Garden with a layer of well-tilled soil at the 

 surface especially if drought is feared. 



Expt. 117. Tools. Make drawings of ten tools, 

 briefly writing opposite to each its most important use. 



DRAINAGE 



(See Tropical Readers, Book II, pp. 92-95.) 



Expt. 118. Drainage a Necessity. Dig up a 

 growing weed carefully and plant it in a pan that has 

 no drainage holes; keep the soil moist, and the plant 

 will soon die owing to excess of water. 



Expt. 119. Water is found Below the Surface of 

 the Soil. 



(a) Dig deep holes in three different kinds of soils and 

 note the depth at which the soil shows signs of being moist. 



(b) Make a list of any wells that there are in the 

 district and the depth at which water is obtained. 



Expt. 120. To detect whether Drainage is Neces- 

 sary. Select a portion of soil and 



(a) Examine surface soil and subsoil, noting if it is 

 clayey and wet, 



(b) Push a stick into the soil and observe if water 

 is found in the hole when the stick is taken out. 



(c) Note if soil sticks to tools. 



(d) Try an experiment on a portion of land in the 

 School Garden to discover whether drainage trenches 

 improve the return. 



( C 282 ) 5 



