EXPLANATION OF PLATES 105 
21. ———— Ueber Befruchtung und Zelltheilung. 
22. Treub, M. Sur les Casuarinées et leur place dans le zen nat- 
urel. Ann du Jard. Buit. 10: 145-231. 1891. 
23. Zinger, N. Beiträge zur Kentniss der weiblichen Blüten und In- 
florescenzen bei Cannabineen. Flora, 85 : 189-253. 1898. (The 
author presumes that this paper includes Zinger’s previously stated re- 
sults which are recorded as follows: (1) Beitrag zur Entwickelungsge- 
schichte des Hanfs. Trav. Soc. Imper. Nat. St. Pet. Livr. 1. Comptes 
Rendus des Sciences. 1896. No. 4. (2) Beitrag zur Morpho- 
logie der Fam. Cannabineae. /éid. Comptes Rendus. 1896. 
No. 7-8.) 
Explanation of Plates 
'The letters in the following gen signify as follow 
ant., antipodal c cell (or nucleus). n. c., nutritive cells i the chalaza. 
ar., archespo û. t., pollen-t 
€. efi., Eie epidermis. s». srophiolar den of brown cells. 
e. s., embryo-sac. 5. £., strophiol : 
PLATE 5. Callipeltis cucullaria 
Fic. 1. An early stage in the growth of the nucellus. The men is de- 
limited and the periclinal divisions giving rise to the integument are to be se 
Fıc. 2. Older conditions of the nucellus in which the archesporial cells are ap- 
intend maturity. 
Fic, 3. A nucellus cut es showing a larger number of archespores than 
wade be seen in a radial s 
G. 4. A radial ieu section through a mericarp. The formation of 
Sun has been consummated and one especially large one may be seen before it 
has started to migrate. The micropylar canal is, therefore, intact. 
. A group of sace in which one, the lowest one in the figure, has en- 
iet ndi is preparing for migra 
G. 6. The migrating megaspore may be seen lying in the micropylar tanal, the 
E rans of which has been end by the activity of the moving cell. 
Fic he final division of the embryo-sac cells to form the eight cells of the 
nearly mature condition of that o 
Fic. 8. An instance in which two megaspores have migrated and have given rise 
to two nn formed embryo-sacs. 
G. 9. An embryo-sac after fertilization has taken place. The embryo is in the 
vera state and the endosperm nucleus is in its first division. The material de- 
rived from the disintegrating megaspore has completely disappeared. 
PLATE 6. 
Fics, 1-12. Callipeltis cucullaria. 
Fic. 1. Ovule in longitudinal section at the time of the migration of the mese 
sac-mother-cell, and before its division. The remains of the megaspore mass may sti 
e seen 
