REVIEW ON GERMINATION 



169 



are seen emerging from the two ends of the caulicle- 

 sheath, c, m; the epicotyl has grown to p; the first 

 plumule -leaf is at o. 



REVIEW. What does a seed contain? What do you understand 

 by the embryo? What are its parts? Where is the food in the seed? 

 What are the seed -coats? What is 

 the micropyle? Hilum? How may 

 the position of the micropyle be 

 determined? How do seeds differ? 

 With what are these differences as- 

 sociated? What is germination? 

 Under what conditions does a seed 

 germinate? When is germination 

 complete? What is the first phenom- 

 enon of germination? Explain the 

 relation to O and CO 2 . Define hypo- 

 cotyl. Epicotyl. Hypogeal and epi- 

 geal germination. What becomes 

 of the plumule? Explain germina- 

 tion in a seed which you have 

 studied. 



NOTE. Few subjects connected 

 with the study of plant- life are so 

 useful in school -room demonstra- 

 tions as germination. The pupil 

 should prepare the soil, plant the 

 seeds, water them, and care for the 

 plants. Plant in pots or shallow 

 boxes. Cigar-boxes are excellent. 

 The depth of planting should be 

 two to three times the diameter of 

 the seeds. It is well to begin the 

 planting of seeds at least ten days 

 in advance of the lesson, and to 

 make four or five different plantings 

 at intervals. A day or two before the study is taken up, put seeds to 

 soak in moss or cloth. The pupil then has a series from swollen 

 seeds to complete germination, and all the steps can be made out. 

 Dry seeds should be had for comparison. 



Good seeds for study are those detailed in the lesson, bean, 

 castor bean, corn. Make drawings and notes of all the events in the 



295. Germination is complete, p, top 

 of epieotyl ; o, plumule-leaf ; m, 

 roots; c, lower roots. 



