OF CooPERIA DRUMMONDII 405 
Fic. 12. Four-celled embryo, from fresh material cut on freezing microtome, 
ESO. ; 
Fic. 13. Longitudinal section through young embryo, from fresh matérial cut 
on freezing microtome, X 150. 
Fic, Outline of young embryo and unas with endosperm at one side, 
from free-hand section of fresh material; 4 ocular, 7 0 tive 
Fic. 15. Outline of embryo with suspensor, tn niche ite petting point 
is developing, from free-hand section of fresh m aterial; 4 ocular, 7 0 
Fic. 16. Outline of embryo with suspensor, showing further perieeners ofa 
growing point over which is a transparent cell-like membrane; 4 ocular, 7 objective. 
i Free nucleus from endosperm; cytoplasm in which nucleus is imbedde 
not shown in drawing. Oil immersion. 
Fic. 18. Cell walls being laid down between free nuclei of endosperm; walls 
warped by apres ing: diagrammatic, X 60. 
Fic. 19. Outline of embryo, showing differentiation of root, sheath, plumule, 
and cotyledon regions, X 70. 
Fic. 20. Outline of immature embryo, X 60. 
Fic. 21. Diagram of mature seed, showing seed coats, endosperm, and embryo 
fitting loosely in the endospe 
Fic. 22. Mature a dieecied out of ovule; 2 ocular, 1 inch Beck ob- 
jective, 
Fic. 23. Longitudinal section through mature embryo, X 150. 
