The Plantlet. 



35 



let is often unable to burst the seed-case, hence germi- 

 nation cannot take place unless assisted by the expand- 

 ing power of frost, or long exposure to moisture which 

 softens the seed-case, or unless the seed-case is cracked 

 before the seeds are planted (36). 



44. The Roots promptly start, as the hypocotyl 

 emerges from the seed-case—the main (primary) root 



Fig. 8. Plantlet, Fig. 9. Plantlet Fig. 10. Plantlet Fig. 11. Plantlet 

 of pumpkin. of bean. of Indian corn. of pea. 



In the pumpkin and bean, the seed-leaves (eotyledonsj are lifted. 



above the surface of the soil in germination. 



In the pea, the cotyledons are not lifted above the surface of the 



soil in germination. 



from its point, and the branch (lateral) roots from its 

 side. Sometimes root-hairs (100) may be distinctly 

 seen, especially when seeds germinate in the seed-tester 

 (38). 



By studying Figs. 8 to 11, we may learn more of the 

 germinating process. 



45. The Cotyledons (co-ty-le'-dons). In the bean 

 and pumpkin, the seed, or what remains of it, seems to 



