38 
Humphrey . — The Development of the 
EXPLANATION OF FIGURES IN PLATES I-IV. 
Illustrating Dr. Humphrey’s paper on the development of the seed in the 
Scitamineae. 
List of abbreviations used : — a. archesporial cell ; al. aleurone layer ; ant. anti- 
podal cells ; ar. aril ; c. constriction of funiculus ; ch. chalaza ; ch. i. i. chalazal 
inner integument ; ch. m. chalazal mass ; e. egg-cell ; egg. egg-apparatus ; emb. 
embryo ; end. endocarp ; e. s. embryo-sac or the cavity developed from it ; 
e. s. m. embryo-sac mother-cell ; esp. endosperm ; esp. n. endosperm-nucleus ; 
exoc. exocarp ; ext. outer layer of outer integument ; f. funiculus ; g. 1. germinal 
lid ; g. s. germinal slit ; i. i. inner integument ; int. inner layer of outer integu- 
ment ; l. 1. light line; m. micropyle ; in. c. micropylar collar; in. p. micropylar 
pad ; n. nucellus or nucellar tissue ; n. e. nucellar epidermis ; nut. nutrient layer 
of outer integument ; o. i. outer integument ; ov. c. cavity of ovary ; p. c. peri- 
sperm-canal ; per. pericarp ; psp. perisperm ; p. t. pollen-tube ; scl. sclerotic layer 
of testa, rudimentary or developed ; scl. p. sclerotic plug ; st. stoma ; syn. syner- 
gidae ; t. testa ; tap. tapetal cell or cells ; v. b. vascular bundle. 
Note. — All sections pass through the plane of symmetry of ovule or seed, unless 
otherwise stated. 
PLATE I. 
Figs. i-i9a. Canna indica , L. 
Fig. i. A young ovule just after the first division of the archesporial cell, 
x 350- 
Fig. 2. A nucellus after the first division of the embryo-sac mother-cell ; i°, the 
cell cut off by the division, x 260. 
Fig. 3. A nucellus after the second division of the embryo-sac mother-cell ; 
i° and 2 0 , the two cells cut off. x 260. 
Fig. 4. An ovule ready for fertilization, the antipodals not shown, x 100. 
Fig. 5. Young seed of -8 mm. in length, showing at c the beginning of the 
constriction of the funiculus. x 22. 
Fig. 6. Young seed 1.5 mm. long, showing upward bending of inner integument, 
x 22. 
Fig. 7. Young seed 2 mm. long. X22. 
Fig. 8. Young seed 3 mm. long. X22. 
Fig. 9. Contents of embryo-sac of a young seed 3 mm. long, x 200. 
Fig. 10. Part of micropylar end of a seed of 4 mm. x 22. 
Fig. 11. Region of the germinal slit of a young seed of 4 mm. x 200. 
Fig. 12. Section of ripe seed, with embryo removed, x 2. 
Fig. 13. Micropylar end of testa, showing kite-shaped area free of stomata, 
x 3- 
Fig. 14. Part of micropylar end of ripe seed, showing distribution of tissues in 
the testa. X22. 
Fig. 15. Structure of coat of a young seed 2*5 mm. long. x 200. 
Fig. 15 a. Details of outer layers of Fig. 15. X530. 
