NOTE ON GEKMINATION 



171 



germination. Note the effects of unusual conditions, as planting too 

 deep and too shallow and different sides up. For hypogeal germina- 

 tion, use the garden pea, scarlet runner or Dutch case-knife bean, 

 acorn, horse-chestnut. Squash seeds are excellent for germination 

 studies, because the cotyledons become green and leafy and germina- 

 tion is rapid. Its germination, as also that of the scarlet runner 

 bean, is explained in "Lessons with Plants." Onion is excellent, 

 except that it germinates too slowly. In order to study the root 

 development of germinating plantlets, it is well to provide a 

 deeper box with a glass side against which the seeds are planted. 



Observe the germination of any seed which is common about the 

 premises. Where elms and maples are abundant, the germination of 

 their seeds may be studied in lawns and along fences. Figs. 296 to 

 303 suggest observations on the Norway maple, which is a common 

 ornamental tree. 



/ When studying germination, the pupil should note the bifferences 

 in shape between cotyledons and plumule -leaves and between plu- 

 mule-leaves and the normal leaves of the plant. Fig. 143. Make 

 drawings. 



Germination of beans and peas. 



