238 APPENDIX 



4. With cork or wax, carefully close the lower end of 

 one of the funnels. 



5. Carefully measure into the funnel that has the lower 

 end of its stem closed, a sufficient amount of water thor- 

 oughly to cover the clay in the funnel, and carefully 

 cover funnel with watch glass. 



6. Over the. soil in the funnel with the open stem, care- 

 fully pour an amount of water equal to that placed on the 

 soil in the other funnel, but do not cover with watch glass. 



7. At the end of two days remove the watch glass from 

 the first funnel and allow to stand until the soil has become 

 thoroughly dry. The cork or wax may be removed from 

 the lower end of the stem and the funnel may be placed 

 in a warm place to hasten the drying. 



8. When both lots of clay have become thoroughly dry, 

 carefully study the two masses with regard to compactness 

 and resistance to crushing. 



EXPERIMENTS 13-18 

 Apparatus 



For the four following experiments, the apparatus shown 

 in Fig. 93 will be used. It is practically the same as 

 that devised by King, and illustrated in his Physics of 

 Agriculture, p. 293. 



It is suggested that tile 1 be a 4-inch cement tile of 

 dry mix in the proportions of 1 of cement to 5 of sand. 



That tile 2. be a 4-inch cement tile of wet mix in the 

 proportions of 1 of cement to 3 of sand. 



That tile 3 be a 4-inch clay tile of dense texture. 



That tile 4 be a 4-inch clay tile of as open texture as 

 can be found. 



