1911] BROWN & SHARP—EPIPACTIS - 451 
but the general structure of the angiosperm embryo sac may be 
indicated by some features in those of the gymnosperms. 
The writers wish to express their thanks to Professor C. B. 
Davenport, director of the biological Laboratory of the Brooklyn 
Institute of Arts and Sciences, for courtesies shown them during 
their stay at Cold Spring Harbor; and to Professor D. S. JouNsoN 
for helpful suggestions and criticisms during the progress of the 
work. 
LITERATURE CITED 
1. Brown, W. H., The nature of the embryo sac of Peperomia. Bor. Gaz. 
46: 445-460. pls. 31-33. 
, The embryo sac of Habenaria. Bor. Gaz, 48:141-250. figs. 
I2. 1909. 
3-——, The embryo sac of Strelitzia. 
4- COULTER and CHAMBERLAIN, Morphology of angiosperms. 1903. p. 80. 
5- Ernst, A., Zur Phylogenie des teens der —— Ber. 
Dedisch. Bot. Gesells. 26: 419-437. 8. 
6. Harper, R. A., The organization of setith coenobic plants. Bull. Univ. 
Wisconsin, Science Series 3: 279-334. 1908. 
7- Jounson, D. S., A new he of embryo sac in Peperomia. Johns Hopkins 
Univ. Cir. 195:19-21. 190 
8. Livincston, B. E., Chemical stimulation of a green alga. Bull. Torr. 
Bot. Club 32:1-34. 1905. 
9. McALuister, F., Se sapere of the embryo sac of Smilacina stellata. 
OT. GAZ. 48:2 ats. OF. .75, 
to. MurBEcK, S., Pationecuseche Embryobildng in der Gattung Alche- 
milla. RES Univ. Arsskrift 367: 46. 1 
tr. Pace, Luta, Fertilization in Cini Bor. Gaz. 44:353-374. pls. 
24-27, 1908. 
12. Porscu, Orro, Versuch einer phylogenetischen Erklarung des Embryo- 
sackes und der doppelten Befruchtung der Angiospermen. 1 
13. ROSENBERG, O., Ueber die ee in der Gattung Hieracium, 
Ber. Deutsch. Bot. Gesells. 24: 157-161. 
14. SPEMANN, H., Ueber Linzenbildung nach ‘cet Entfernung der 
primidren Linsenbiidunaseetiead Zool. Anz. 28: 419-432. figs. 9. 1905. 
15. STEPHENS, E. L., The embryo sac and embryo of certain Penaeaceae. 
Ann. Botany 23: ene: pls. 25, 26. 1909. 
16. STRASBURGER, E., Die Samenlage von Drimys Winteri und die Endosperm- 
bildung bei Ansiospecnen. Flora 95: 215-231. 1905. 
2. 
