1922] RANDOLPRH—MAIZE 375 
PLATE XIV 
Maternal inheritance strain 
Material from uniformly yellowish green 3-inch seedling; amount of 
green color indicated by depth of shading. 
Fics. 33-38.—Showing development of plastids in undifferentiated apical 
regions of successively older seedling leaves. 
Fic. 33.—Promeristematic region. 
Fic. 34.—From first leaf bud. 
Fic. 35.—From leaf bud 4 mm. long. 
Fic. 36.—From tip of embryonic leaf 20 mm. long. 
Fic. 37.—From tip of embryonic leaf 40 mm. long. 
Fic. 38.—From tip of leaf about to emerge from sheath. 
Fics. 39-41.—From mesophyll tissue of 3-inch seedling leaf; fig. 39, 
cell between vascular bundles; fig. 40, cell nearer vascular nde fig. 41, cell 
adjacent to vascular bundle. 
PLATE XV 
Fics. 42-46.—From fully developed mesophyll leaf tissue of mature 
normal green plant; amount of green color indicated by depth of shading. 
Fic. 42.—Cell from region of leaf blade inclosed in enveloping leaves. 
Fics. 43-45.—Stages occurring in mesophyll tissue between mete 
and exposed regions of same leaf. 
Fic. 46.—Mesophyll cell from exposed region of fully developed leaf. 
Fics. 47-49.—Epidermal cells of seedling leaf tissue of 3-inch seedling: 
fig. 47, cell near apex of 40 mm. embryonic leaf; fig. 48, cell from same leaf, but 
slightly farther from tip; fig. 49, cell of 40 mm. embryonic leaf blade. 
PLATE XVI 
Fic. 50.—From striped plant of maternal inheritance strain, showing cells 
from transitional region between yellowish green stripe and green stripe; 
depth of shading indicates amount of green color present. 
Fic. 51.—From 35 mm. embryonic leaf of a normal green 3-inch seedling, 
showing grouping of many proplastids about nucleus. 
1G. 52.—From same tissue as fig. 51, showing effect of osmic acid (z per 
cent aqueous solution) fixation on proplastids. 
1G. 53.—From young leaf tissue after Benda’s fixation and iron- 
haematoxylin staining. 
