Seeds and How They Grow 



509 



seen that there is no oxygen present, since the candle will at once 

 cease to burn. Hence we conclude that the oxygen was consumed 

 in the process of germination. The covered jar serves as a check, 

 or control. 



To Show the Necessity of Heat and Moisture for Germi- 

 nation. Place a number of pea seeds in each of three jars. Soak 

 the seeds in one jar and leave it in a warm place. It serves as a 

 check, or control. Soak the seeds in the second jar and leave it 

 in a cold place. Keep the seeds in the third jar dry and leave it 

 in a warm place. Examine the seeds periodically for a week or 



EXPERIMENT TO SHOW THAT CARBON DIOXIDE is PRODUCED DURING 

 GERMINATION 



ten days. In which jars do the seeds germinate? What do you 

 conclude concerning the necessity of heat and moisture for 

 germination ? 



A fourth jar, prepared like the first but left in a dark place, 

 can be used to prove that light is not necessary for the germina- 

 tion of seeds, though it is needed for the later development of 

 plants. 



To Show That Carbon Dioxide Is Produced During 

 Germination. Using two jars, place a quantity of soaked seeds 



