16 SEEDS AND SEEDLINGS 



(6) Plant as in (a) but keep in a warm, dark closet. 



(c) Plant as in (a) but keep in a cool, well-lighted place. 



(d) Plant as in (a) but use a glass vessel instead of a flower pot, 

 completely cover with water and keep in a warm, well-lighted place. 



Examine; all the above from time to time to determine the moisture, 

 heat and light requirements. Write an account of results with 

 explanations. 



14. Plant seeds in a pot, keep well watered in a warm place, but 

 covered with a box permitting the entrance of light from one direction. 

 (The interior of the box should be painted black.) Note the direction of 

 growth of the various parts. Explain. 



15. Work of Cotyledons. Plant several beans in a pot and keep in 

 favorable condition for germination. As soon as the seedlings appear above 

 the surface remove one cotyledon from each of one-third of the plants, and 

 both cotyledons from each of one-third of the plants. Take note on the 

 growth of the three sets of plants for several days. Explain difference. 



16. Water Requirements for Growth. Select two flower pots of the 

 same size and weight. Cans with holes in the bottoms may be used. Secure 

 enough garden soil to fill them; sift to remove all pebbles and mix thor- 

 oughly to secure uniformity of character. Fill the two pots with equal 

 amounts (by weight) of soil. Plant six or more kernels of corn in one 

 and set both in a warm, light place. 



17. Set an ordinary piece of window glass in one side of a deep box. 

 Fill the box with soil and plant seeds at various depths against the glass, 

 so that their growths can be observed from the outside. Cover the glass 

 with black cloth or paper, so that it can be easily removed for observation. 

 Supply the necessary amount of water, keep in a warm place and note the 

 germination and growth from time to time. What is the proper depth for 

 planting seeds of this kind? 



18. Partly fill a cigar box with wet sand. Cover the sand with a cloth 

 that has been ruled into squares. Place a^ certain number of seeds in each 

 square. Cover with a wet canton flannel cloth, and put in a warm place. 

 Examine after forty-eight hours and estimate the percentage of germina- 

 tion. Make a second estimate after ninety-six hours. (This experiment 

 should be tried with a number of different kinds of seeds from various 

 sources.) How can seed) testing be made of advantage to the farmer? 



19. Put A few beans and a little water in each of two bottles. Fill 

 one bottle with oxygen and the other with any other kind of gas. Close 

 both in such a manner as to prevent the escape of the gas. Note the 

 germination. 



20. Gas Formed During Germination. Put a few beans and a lit- 

 tle water in each of two bottles. Stopper one with a good cork and leave 



