EXERCISE 26 



Problem. Does the sprouting of seeds produce any change in the surrounding air ? 



What to use. Two flasks or bottles ; seeds ; corks ; vials containing 

 limevvater ; wire ; splints ; matches. 



What to do. Place soaked seeds in each bottle ; to one add a few 

 drops of formalin to kill the seeds ; carefully suspend a vial of limewater 

 in each with a wire ; cork ; seal. 



Record. After twenty-four hours note what happens to the limewater ; 

 shake gently and observe again. Test both bottles for oxygen. What 

 happened to the lighted splints ? to the spark ? 



Conclusions. What gas is increased in quantity when seeds sprout ? 

 What gas is diminished in quantity ? 



Questions. 1. What is the probable relation between the changes in the air and changes inside 

 the seed ? 



2. Why were two bottles used in this experiment ? 



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