Teachers' Leaflet. 



567 



to be equal to the sand. Set the 

 two chimneys in a dish and pour 

 water into the bottom of the dish 

 and note which takes water (up 

 hill) the fastest and which the 

 highest. 



When the upward movement 

 stops in each lamp chimney, 

 weigh and compare with the dry 

 weight. This will determine the 

 power of each to draw water 

 from the water table towards 

 the surface for the use of plants. 



LESSON CXXXVL 



WHY CLAY BECOMES HARD AND 

 BAKED. 



Purpose. — To show relative 

 capillary power of clay and 

 humus. 



Experiment. — Same as above 

 experiment excepting that you 

 substitute clay for the sand. If 

 cheese cloth is tied over the bottoms of the lamp chimneys, the experi- 

 ments mav be more conveniently done. 



Hozv water climbs through sand. 



LESSON CXXXVL 



WHY CLAY BECOMES HARD AND BAKED. 



Purpose. — To show relative capillary power of clay and humus. 



Experiment. — Same as above experiment excepting that you substi- 

 tute clay for the sand. If cheese cloth is tied over the bottoms of the 

 lamp chimneys, the experiments may be more conveniently done. 



LESSON CXXXVII. 



THE FERTILITY IN THE SOIL. 



Purpose. — To teach the pupils how to determine the amount of 

 humus in any soil. 



Experiment. — Take samples of soil, one from the garden or other 

 notably fertile plot and another from a knoll where but little is growing 

 but mullein or stunted briars. Kiln dry the samples and weigh, keeping 



