The Plantlet. 



35 



plum, peach and cherry, the enlarging plantlet is often 

 unable to burst the seed- case, hence germination cannot 

 take place unless assisted by the expanding 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 (37). 



45. The Roots promptly start, as the hypocotyl emer- 

 ges from the seed-case the main (primary) root from 

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

 Sometimes root-hairs (101) may be distinctly seen, espe- 

 cially when seeds germinate in the seed-tester (39). 



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

 germinating process. 



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 (cotyledons) 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. 



