1904] WYLIE: ELODEA CANADENSIS 19 
root probably does not function, and secondary roots are devel- 
' oped in the seed from the lower parts of the stem. 
THE UNIVERSITY OF CHICAGO. 
o LITERATURE CITED. 
1. CAMPBELL, D. H., A morphological study of Naias and Zannichellia, 
Proc. Calif. Acad, Sci. III. 1: 1-62. pls. 7-5. 1897. 
2. CHAMBERLAIN, C. J., Contribution to the life “hasta of Salix. Bort, 
GAZ, 23:147-179. pls. 12-78, 1897. 
. COULTER, }. M,, aciebtdon to abe life history of Ranunculus. Bor, 
3 
GAZ. 25: 73-88. pls. 4-7. 1898. 
4. - AND CHAMBERLAIN, C, J., Morphology of angiosperms 137. 1903. 
5. EICHLER, A. W., Bliithendiagramme. Erster Theil. Leipzig. 1875. 
6. GUIGNARD, L., Nouvelle études sur la fécondation. Ann. Sci. Nat. Bot. 
VII. 14: 163-296. pls. g—78. 1 
7. , La double fécondation sur le Mazas major. Jour. Botanique 
ie ae 213. figs-7 Zs FOOT. 
8. , La double fécondation chez les Solanées. Jour. Botanique 
16: 145-167. figs. 45. 1902 
9. - , Le double gen chez les Cruciféres. Jour. Botanique 
16: 36% —368, figs. 20 2. 
ro. Harty, |. .H,, An embryoogica study of Limnocharis emarginata. BOT. 
GAZ. 33:214-219. fl. 9 2 
tt, HORN: Zur CS Te aE der Blithe von £lodea canadensis. 
Archiv der Pharmacie III. 1. 426-433. A/. 7. 18 
12. ROSENBERG, O., Ueber die Pollenbildung von Zostera. Meddel. Stock- 
holms Hégsk. Bot. Inst. pp. 2 
13. SCHAFFNER, J. H., A contribution to the life open rs cytology of 
Erythronium. Bort. GAZ. 31 : 369-387. pls. g-9. 
14. SHIBATA, K., Die Doppelbefruchtung bei pt ae an L. Flora 
go: 61-66. 1902. 
15. SHOEMAKER, D. N., Notes on the development of Hamamelis virgin- 
zana L. Johns Hopkins Univ. Cir. 21: 86-87. 1902 
16. STRASBURGER, E., Ein Beitrag zur Kenntniss von Ceratophyllum sub- 
mersum und phylogenetische Erérterungen. Jahrb. Wiss. Bot. 37: 477— 
26. pis. Q-II. 1902. i 
EXPLANATION OF PLATES I-IV. 
All figures were made with Bausch and Lomb camera lucida, and original 
drawings were reduced one-half in reproduction. Figures with magnifica- 
tion greater than 600 diameters were made with Zeiss apochromatic objective 
2™™, 1.30 N. A., and Zeiss compensating oculars 4 and 12. All others with 
Spencer 5™™ and 16™™" objectives and oculars 4 and 8. The original 
