NATURE-STUDY LESSONS. 127 



3. Plant similar seeds in moistened sawdust and place 

 within a refrigerator, or, if during winter, place outside 

 and note what changes, if any, occur in the seed-develop- 

 ment. 



4. From these experiments infer the proper conditions 

 for the growth of the embryo. 



5. («) Fill a box about twenty inches long, eight inches 



wide, and six inches deep, with sawdust or 

 earth and plant in it a dozen of each of the 

 following seeds : — Common bean, pea, corn, 

 radish, onion, squash and two or three castor- 

 beans. Soak the seeds in tepid water for a 

 day before planting. Place them about an 

 inch deep and moisten the contents of the 

 box each day. Keep in a warm place ; for 

 example, in a south window of a warm room 

 if the experiment be performed in winter or 

 very early spring. 

 ((5) Examine some of the seeds daily after the 

 second day, by gently stripping the sawdust 

 or earth, and note carefully what changes 

 have taken place. 



6. Make drawings as soon as any signs of growth 

 begin, and continue to make drawings showing particu- 

 larly the successive stages in the development of each of 

 the different kinds of seeds. Mark under each drawing 

 the number of days which have elapsed since planting. 



7. At what point did the seed-coat first break ? 



8. Which part of the kernel first emerged ? 



9. Which part of the seed first appeared above the 

 surface ? 



