APPENDIX 279 



each water that has been boiled 20 minutes ; cover the 

 water in one bottle with a little olive or cotton-seed oil. 

 It is important to soak the seeds a short time in boiled 

 water before putting them into the bottles to remove 

 the air in contact with their seed-cases. 



Germination hastened by soaking seeds (35) . — Soak 

 seeds of Indian corn two or three hours in warm water, 

 and let each student place in a seed-tester a sample of 

 the soaked seeds, with one or two other seeds of the same 

 kind that have not been soaked. 



Germination hastened by mutilating the seed-case (36). 

 — This may be illustrated with seeds of the navy bean, 

 in the seed-tester. 



The plantlet (40). — Place seeds of radish, onions, etc., 

 loosely on the surface of a saucer filled with fine moist 

 loam; keep the surface moist and note the repeated at- 

 tempts of the hypocotyl to enter the soil. 



Seeds of the pumpkin family should be planted flat- 

 wise (42) . — Plant seeds of the pumpkin or squash, in 

 the three positions indicated, in large greenhouse sau- 

 cers. Cover each saucer with a pane of glass and place 

 all in a warm room until the plantlets appear, after which 

 note the number of each lot of seeds of which the seed- 

 case appears above the surface. 



Development of plantlets (44-46) . — Devote several ex- 

 ercises to a study of the development of plantlets of 

 the bean, pea, wheat, Indian corn, pumpkin, etc. To 

 furnish the plantlets, seeds of the different sorts should 

 be planted on several successive days, beginning at 

 least 10 days in advance. 



Not all seeds should be deeply planted (47) . — Plant 

 seeds of the bean, pea, Indian corn and wheat in 6-inch 

 flower pots, at three different depths, viz., 2 inch, 3 



