66 BOTANICAL GAZETTE [JANUARY 
8. 1880. BARBECK, Wm.: On the development of Lemna minor. Proc. 
Acad. Philadelphia 1880 ; 230-232. : 
9. 1889. ENGLER and PRANTL: Die natiirlichen Piece 
IT. 3: 154-164. ay 
10. 1894. Guppy, H. B.: On the habits of Lemna minor, L. gibba, and 
Ae oo Jour. Linn. Soc. (Botany) 30 : 323-330. i 
McMinn, AMELIA: Structure of the vegetative shoots of : 
ae polyrrhiza, Library of Univ. of Wisconsin. Unpublished. 
12, 1896. HEGELMAIER, F.: aera tae Ubersicht der a o 
Engler’s Jahrb. ar : 268-305. 4 
13. 1896. SCHAFFNER, J. H.: The embryo sac of A/isma Plantago. Bot. 
Gar, ax 5125-152. 
14. 1897. CAMPBELL, D. H.: A morphological — of Naias and Zani- 
chellia. Proc. Calif. Acad. Sci. III. (Botany) 1:1- 
15. 1897. CouLrer, J. M.: Contribution to the life-history of Lilium 
Philadelphicum. Bot. Gaz. 23: 412-422 
16. 1897. THOMPson, C. H:: North American Lemnacez. Annual 
Report of the Missouri Botanical Gardens 9g (1 I-22. ; 
17. 1898. COULTER, J. M.: Contribution to the life- -history of Ranuncu- 
lus. Bot. Gaz. 25: 73-88. 
18. 1898. CAMPBELL, D. H.: Lilea subulata. Ann. Bot. 12: 1-28. 
19. 1898. ELMone, C..J,: Some results from the study of Allium. Bot. 
Gaz. 26 : 277-278, 
