Sa ce a ae i te 
snl esti ties ne pags si 
1898] THE LIFE-HISTORY OF RANUNCULUS 87 
Figs. 34, 35. The same, showing first and last stages in the development 
of the mother-cell row. 
Figs. 36-40. Stages in the nuclear divisions of the embryo sac of &. 
septentrionalis (except fig. 39, which is from R. mudtifidus). In every case 
the micropylar end is the upper one. In fg. go the antipodal spindle shows 
polar radiations at one endand a multipolar character at the other. Zeiss oc. 
18, obj. 2™" (except fig. 39). 
PLATE VI, 
Fig. 41. Embryo sac of 2. seftentrionalis, showing completion of the 
second nuclear division. Zeiss oc. 6, obj. 2 
FiG. 42. The same, showing spindle of the third division. Zeiss oc.'4, 
obj. 2™™, 
Figs. 43-46. A series from the embryo sac of &. multifidus, showing 
pine of polar nuclei and the organization of the egg apparatus. Zeiss oc. 
» obj. 2™™, 
Fig. 47. Mature embryo sac of A. mudtifidus. 
Fic. 48. Mature embryo sac of Hefatica acutiloba. 
Fic. 49. Antipodal cells of A. acutiloba, showing extensive unequal 
mitotic divisions. Zeiss oc. 6, obj. 2™™. 
FIG. 50. The same, Zeiss oc. 3, Obj. 2". 
Fic. st. Embryo sac of 2. septentrionalis, showing pollen tube, fusion 
of sex nuclei, and the disorganized but discharged second male cell. 
. Fig. 52. Embryo sac of 2. multifidus, showing discharge of male cell at 
me distance from the oosphere nucleus, also the very large definitive nucleus. 
igen 53- Embryo sac of 2. septentrionalis, showing undischarged pollen 
’pproaching the oosphere nucleus. 
3 PLATE VU, 
“a ne Embryo sac of 2. multifidus, with free endosperm nuclei and 
a wided oospore. Zeiss oc. 18, 0 1S ae 
dle 'G. 55. The same, showing simultaneous formation of endosperm spin- 
€s. Zeiss oc. 6, Goby. 2=™ 
Fig. « : : 
piles ane An endosperm spindle of R. multifidus, showing very clear 
tations. Reichert oc. 12, Leitz obj. ry. 
Fig, 
une as 57. Embryo sac of R. septentrionalis, showing the one-sided enlarge- 
endos the sac, the lateral position of the antipodals, the parietal layer of 
Perm nuclei, and a two-celled embryo. 
«Fie. 5 
mache 38. Embryo sac of 2. multifidus, with egg and free endosperm 
