j 2 AGRICULTURE 



4. Fasten two panes of glass together by a wooden frame, as illustrated. 

 Fill the box thus made with fertile soil. As you put in the soil, plant corn 

 and beans close to the glass, at depths of four, three, and two inches, one 

 inch, half an inch, and a quarter of an inch. Cover the glass with dark 

 paper and keep in a warm place. Remove the paper every day and 



ILLUSTRATION OF EXPERIMENT 4 



examine the seeds. What difference is there in the germination of seeds 

 at different depths ? Which plants make their way to the surface from 

 the greater depth, corn or beans, and why? 



5. Plant twenty-five morning-glory seeds in a box of fine soil and press 

 them down firmly with a board. Plant twenty-five seeds in a box of 

 rough soil and leave it loose. What difference is in the number and 

 appearance of plants in the two boxes ? 



6. Weigh one hundred seeds of several different kinds, such as peas, 

 clover, and corn. Put them in water and weigh again in twenty-four 

 and in forty-eight hours. What difference is there in weight? What 

 does this prove as to the moisture required in the germination of differ- 

 ent kinds of seed ? 



