HOME AND SCHOOL EXERCISES 



71 



of seed may be used at each depth. The soil should be packed 

 uniformly ajid the moisture conditions kept as nearly perfect as 

 possible. Place in a warm room and record the time required for the 

 seeds at different depths to germinate. The location of those at each 

 depth may be marked on the side of the box with pencil or on the side 

 of the glass jar with paper labels. The exercise may be varied as 

 shown in figure 47. 



If the soil used is a sample from the garden, the exercise 



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Fig. 47. — ^An exercise to test the depth for planting corn or garden seeds of any 

 kind. (Agriculture and Life.) 



may be valuable in determining the best depth at which to plant 

 seeds. If planted too deep, seeds may rot before reaching 

 the surface. If planted too shallow, they may suffer more 

 from drouth because their root systems are too near the dry 



surface. 



8. Carbon Dioxide from Germinating Seed. — Put a half pint 

 of germinating beans in a glass jar. Place among these a wide- 

 mouthed bottle containing clear lime water and cover the glass jar. 

 After a few hours, the lime water vrill show a cloudy or milky 



