GliRiMlXATiOiV 



2r 



34. Radicle, that part of the embryo below the cotyle- 

 dons, including the caulicle and the nascent root ; by 

 some botanists restricted to the extreme point of the 

 caulicle from which the root develops. 



35. Factors of germination. — Germination depends 

 upon four factors: viability, water, free oxygen and 



FIG. 15— SHADES FOR OUTDOOR PROPAGATING BEDS 



Lath shade. 2. Cloth on frame. The shades may be lifted in dull weather 

 to accustom the plants to the sun. 



