ee 
1897 | THE LIFE HISTORY OF SALIX 175 
20. 1889. HEGELMAIER, F.: Ueber den Keimsack einiger Compositen 
und dessen Umhiillung. Bot. Zeit. 47: 805-812, 821-826, 837-842. 1889. 
21. 1891. GUIGNARD, LEON: Nouvelles études sur la fecondation. Ann. 
Sci. Nat. Bot. VII. 14: 163-296. 1801. 
22. 1891. TREUB, M.: Sur les Casuarinées et leur place dans le systéme 
naturel. Ann. Jard. Buit. 10: 145-231. 1891. 
23. 1893. MoTTieR, DAavip M.: On the embryo-sac and embryo of 
ia aureus. Bort. GAZETTE 18: 245-253. 1893. 
24. 1893. MotrierR, Davip M.: Development of the embryo-sac in Acer 
rubrum. Bor. GAZETTE 18: 375-377. 1893. 
25. - NAWASCHIN, S.: Zur Embryobildung der Birke. Bull. Acad. 
Imp, Sei. = Petersb. III. 35 :[no. 3]. 1893. 
26. 1894. BENSON, MARGARET: Contributions to the enw ltags of the 
Amentifere, Part I. Trans. Linn. Soc. Bot. Il. 3: 409-424. 1894. 
27. 1895. D’HuBeRT, M. E.: Recherches sur le sac enbryonnaie des 
plantes grasses. Ann. Sci. Nat. Bot. VIII. 2: 37-128. 1895. 
28. 1895. CHAMBERLAIN, CHAS.: The embryo-sac of Aster Novze-Angliz. 
Bot. GAZETTE 20: 205-212. 1895. 
29. 1895. MotTieR, Davin M.: Contributions to the embryology of the 
te Bor. GAZETTE 20: 241-248, 296-304. 1895. 
30. 1896. SCHAFFNER, J. H.: The embryo-sac of Alisma Plantago. Bort. 
‘GAZETTE 21 : 123-132. 1806. 
31. 1896. SARGENT, ETHEL: The formation of sexual nuclei in Lilium 
Martagon. Ann. Bot. 10: 445-477. 1896. 
EXPLANATION OF PLATES XII-XVIII. 
List of abbreviations used: a, antipodals; 6, beak, or filiform apparatus ; 
¢, root cap; d, dermatogen: em, embryo; e#, primary endosperm nucleus; 
m, macrospore mother cell; wg, male generative cell; 0, oosphere; on, 
oosphere nucleus; fer, periblem; 7, plerome; f/, pollen tube; sym, syner- 
gid; ¢, tapetal cell. 
All figures, except those of 7. sical and fig. 66a, were drawn with a +, 
Bausch and Lomb immersion and Z \ 
Figs. 1-9,X 594; figs. 10-24,X Pat figs. es X 694; figs. 66-774, X 
390; figs. 78-88, 4o. 
PLATE XU. 
_ Fie. 1. Young anther of Salix glaucophylla. October I. 
Fig. 2. Young anther of Salix tristis. March 31. 
_ Fie. 3. S. SS Swng oe of a sport. 
