McDonald : The Dog s Mercury. 



263 



But, it occasional!}^ happens that a seed germinates very near 

 to the surface, and then, after absorbing the endosperm, the 

 seed leaves are freed from the testa, appear just above the 

 surface (epigeal), separate from each other, and turn green. 

 When such is the case, the h^'pocotyl rises from the soil in the 



I Section of seed: a, endosperm; t, testa; e, embryo. 2.^ Seed 

 germinating. 3. Later stage of germination (seed coat removed), hypo- 

 cotyl arched. 4. Still later stage ; plumule arched ; s, surface of soil. 

 5. Seedling, end of first season's growth ; R, radicle ; h, hypocotyl ; c, coty- 

 ledons (spreading due to removal of seed coat) ; b, bud m axil of coty- 

 ledon ; p, plumule ; 5, surface of soil. 6. Seedling, second year (April) ; 

 a, adventitious roots ; b, shoot developed from bud, h m fig. 5 ; p, remains 

 of plumule; b^, the opposite cotyledonary bud beginning to grow; 

 B-2, bud in axil of scale leaf at base of shoot b, this would form shoot 

 next year; s, surface of soil. 



190S July I. 



