EXERCISE 6. TO SHOW THAT AIR IS NECESSARY FOR 

 THE GERMINATION OF SEEDS AND THE GROWTH 

 OF PLANTS 



Equipment: Two tumblers or quart cans; several 

 grains of corn. 



Method: Fill two tumblers within a half inch of the 

 top with rich soil. Plant in each three kernels of corn. 



Fig. 5. — The Seed Planted in the Tumbler to the right, Rotted because 

 it was Deprived of Air by the Excess of Moisture in the Soil. 



Water tumbler No. 1 only enough each day to keep the soil 

 moist. Keep water in the second tumbler so that it stands 

 a little above the surface of the soil. The seeds in the first 

 tumbler will undoubtedly germinate in a short time, while 



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