418 BOTANICAL GAZETTE [UNE 
Fics. 22-25. Early prophases of mitosis in the first division of the mega- 
spore. 
F1Gs. 26-27. Spirem stage of the first division of the megaspore. 
Fic. 28. The unorganized daughter nuclei of the first division of the meg- 
aspore. 
F1G. 29. Two megaspores in the same nucellus in act of first division, 
showing symmetrical spindles, with short and dense chromosomes arranged 
upon the equatorial plane, suggestive of reduction division. 
Fic. 30. Four-celled stage of embryo sac; June Io. 
FiG. 31. Two embryo-sacs in the same nucellus in the four-celled stage. 
Fic. 32. Embryo-sac with the usual eight cells ; shows the fusion of the 
polar nuclei in the middle portion of the sac. 
F1G. 33. Embryo-sac with two synergids and oosphere in the micropylar 
region, and the polar nuclei in the act of fusion. 
Fic. 34. Synergids with prominent striated beaks crowding into the 
micropyle. 
Fig. 35. Synergids in the micropylar end of the sac and the oosphere sus- 
pended below. 
F1G, 36. Endosperm showing the absence of any tendency to form walls 
at the time of embryo development represented in figs. 78-39. 
1G. 37. Four-celled embryo with one-celled suspensor. 
Figs. 38-39. Embryos showing periclinal division of dermatogen cells 
fig. 39 more highly magnified. 
