NATURE-STUDY LESSONS. 155 



(^) Which substance retains its form ? 



(c) Which is the more adhesive sand or clay ? 



2. (a) Fill two filters, one with sand, the other with 



clay, hollowed so as to form a cup. Gently 

 introduce water into each. 

 (_d) Through which substance does water pass most 

 readily ? 



(c) Observe whether all parts of the surface of the 



ground dries equally fast after rain. 

 {d) Examine the soil where the ground dries most 



readily and describe it. 

 (e) Examine the soil where the ground dries slowly 



and describe this soil. 



3. (a) Have several flower-pots of the same size and 



shape. Dry several kinds of soil, as gravel, 

 sand, clay and garden loam. Place an equal 

 weight of each soil in the pots. Suspend one 

 from a common spring balance and notice 

 the weight registered. Now, slowly pour 

 water upon the soil until it is thoroughly 

 saturated and cover the mouth of the pot 

 with a piece of oiled cloth or oiled paper. 

 Allow the water to drain until no more will 

 flow away. Compare the weight of each pot 

 before soaking with that after all the water 

 has drained away. 



(d) Which soil has increased the most in weight? 



(c) Which has increased the least ? 



(d) To what is the increase of weight due ? 



(e) Which kind of soil will best resist heat and 



drought .' 

 (/) Which kind will be best for wet weather? 



