In conclusion I should like to take this opportunity for thanking 
Dr. H. H. W. Pearson for his help during the early stages of this 
work, which was started at the South African College, and for his 
continued interest in its progress. I am indebted to Professor 
SEWARD for kind permission to’ work at the Cambridge Botany 
School, and to Mr. R. P. Grecory for many helpful criticisms. 
Tue Botany SCHOOL 
CAMBRIDGE, ENGLAND 
LITERATURE CITED 
1. BALICKA-[WANOWSKA, G., Contribution a l’étude du sac embryonnaire chez 
certaines Gamopetales. Flora 86:47-68. 18 
BERNARD, Cu., Sur l’embryogénie de quelques plantes parasites. Jour- 
Botanique 17:23-32, 117-137, 173-186. 1903 
. BILLInGs, F. oe Beitraige zur Kentniss der Samenentwicklung. Flora 88: 
253-318. 190 
CHATIN, J., ae sur 5 re de V’ovule et de la graine. Ann. 
Sci. Nat. Bot. 19: 5-98. 
CouLTeER, J. M., and Ceaianok C. J., Morphology of angiosperms. 
New York. 1909 
DEECKE, TH., Rowrdics recherches sur le développement du Pedicularis 
ee ang. Sci. Nat. Bot. 4:58-63. 1855; see also Zur Entwick- 
lungsgeschichte des Embryo der Pedicularis sylvatica. Bot. Zeit. 13:1855- 
. Dorp, PAut, Recherches sur le développement et la nutrition du sac embry- 
onnaire et . Vendosperme des Buddleia. Bull. Soc. Bot. France 60:9-16, 
92-098. I 
8. ENGLER, og “aud PRANTL, K., Die natiirlichen Pflanzenfamilien. 4: 1805 5. 
9. HorMEIsTER, W., Notes Sethevthaicnvak Ann, Sci. Nat. Bot. 3:209- 
219. 1855. 
10. Litoyp, F. E., The comparative embryology of the Rubiaceae. Mem. 
Torr. Bot. Club 8:27-112. 1902; ex COULTER and CHAMBERLAIN. 
11. Pearson, H. H. W., On the Rooibloem (isona or witchweed). Agric. 
Jour. Union South Africa, May 1912. 
12. ScHacut, H., Sur l’origine de ’embryon végétal. Ann. Sci. Nat. Bot. 
3: 188-208. 18 55; see also Uber den Ursprung des Pflanzenembryo. 
Flora ro and 11:145-158, 161-170. 1855. 
13. Scumip, Epuarp, Beitriige zur Entwicklungsgeschichte der Scrophularia- 
ceae. Bot. Centralbl. 20:175-295. 1906. : 
14. SHARP, L. W., The embryo sac of Physostegia. Bot. Gaz. 52:218~-223- 
Nv 
. 
w 
% 
= 
ae 
a 
15. TULASNE, L. R., Nouvelles études d’embryogénie végétale. Ann. Sci. 
Nat. Bot. 12:21-137. 1849; 4:65-111. 1855. 
