156 ISABUR) NAGAI: 
EXPLANATION OF PLATE IX. 
Figs. 1-2. Oryza sativa. Photomicrographs of the section of milk-ripened grain 1. Trans- 
verse section, x 320. 2. Longitudinal section, x320. p=parenchym of pericarp, t=tube cells, 
i=integument, c=cutinized layer, n=nucellus, a=aleurone layer, ch=chlorophyll bodies, 
Figs. 3-4. Zea Mays. Photomicrographs of the transverse section of milk-ripened grain, 3. 
x350. 4. x45. p=pericarp, c=cutinized layer, a=aleurone layer, s=starchy endosperm tissue, 
Fig. 5. Oryza sativa seedlings. a, germinated in the oxygen free air, showing the absence 
of the radicle. b, germinated in normal air, showing the presence of the radicle and the plumule. 
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