384 BOTANICAL GAZETTE [MAY 
. Meyer, A., Das ig rae in chemischer, morphologischer, und 
biclogiecher Beziehung. Leip 1883. 
7. SCHIMPER, A. S aieesichcioen iiber die om pl of oe eo und die 
ihnen ‘anions Genitde. Jahrb. Wiss. Bot. 16:1-246. 
Brepow, HAns, Beitrage zur Kenntniss der iisiemtashinaes: Jahrb. 
Wiss. Bot. 22:349-414. 1890. 
Famintz1y, A., Sur les grains de chlorophylle dans les graines et les plantes 
germantes. Bull. Imp. Acad. Sci. St. Pétersbourgh IV. 36:75-85. 18093. 
9 
bs 
EXPLANATION OF PLATE XXI 
The abbreviations used are as follows: c, chloroplast; ¢, protoplasm; 
p, protein grains; pf, protein grain with bodies designated as chloroplasts by 
AMINTZIN; dp, protein grains beginning to disintegrate; m, nucleus; /, 
— and disintegrated protein grains; v, vacuole 
Fic ower palisade cell from a cotyledon at the resting seed; the 
peuiets. reserve is seen in the form’of large grains (p); the chloroplasts are seen 
in their usual position near to the cell wall; seven eee are visible in 
this section; 600. 
Fic. 2.—A palisade cell from the cotyledon of a seed 12 hours after planting; 
the protein grains are still intact; the protoplasm has become vacuolated and 
active; at either end of the section of the cell the chloroplasts are seen; 600. 
Fic. 3.—A palisade cell from the cotyledon of a seed 24 hours after plant- 
ing; the protoplasm has become dense and shows no definite structure; the 
chloroplasts are still small; 600 
Fic. 4.—A cell from the palisade layer of the cotyledon of the seed 36 hours 
after planting; the chloroplasts (c) have increased in size; the rudimentary 
hypocotyl and root of the seed have not yet penetrated the seed coats; 600. 
Fic. 5.—A palisade cell 48 hours after the planting of the seed; on the 
protein granules (ff) may be seen the bodies designated by FaMINTZIN as 
chloroplasts; the hypocotyls in the seedlings have a length of 0.6 cm.; 600. 
Fic. 6.—A cell from the spongy layer of a cotyledon in a 60-hour seedling; 
the protein granules (dp) are plainly disintegrating; with the stain used, 
the nucleus first shows at this stage; 600. 
Fic. 7.—A cell from the spongy layer of a cotyledon of a 72-hour seedling; 
the hypocotyls of the seedlings have reached a length of 2.5-3.5 cm.; the 
protein grains have now disintegrated and the cell content has become very 
dense; the chloroplasts are beginning to increase by division; 600 
Fics. 8-11.—Cells from 84, 96, 108, and 120-hour seedlings; the increase 
in size and number of the chloroplasts at different stages can be plainly seen; 
during each succeeding stage the cell content becomes less dense and vacuoles 
appear; 600. 
Fic. 12.—A palisade cell from a cotyledon of a 140-hour seedling; the 
seedling has become independent and the cotyledon is a typical foliage organ; 
X 600 
