28 
Transactions of the Royal Society of South Africa. 
EXPLANATION OF FIGURES. 
All sections were cut with a Cambridge rocking microtome, the thickness varying 
from 4-7 fi. The figures were drawn with the help of a Leitz microscope and a 
Zeiss camera tucida. The sections were cut transverse to the placenta, giving longi- 
tudinal sections of the ovules. 
In all figures: i. Integument; m.m.c. Megaspore mother-cell; n. Nucellus; e.s. 
Embryo sac ; b.c. Egg cell ; s.n. Synergid nuclei ; p. Polar nuclei; p.t. Pollen tube. 
m. Male nuclei ; a. Antipodal nuclei ; b. Embryo ; s. Suspensor ; p.t.n. Pollen tube 
nucleus. 
Fig. 3 
Figs. 1-7. — 1. Young ovule about the archesporial stage, x 196. 2. Young ovule 
showing m.m.c. which directly functions as the embryo sac. x 196. 3. Embryo sac 
nucleus dividing, x 196. 4. Equatorial arrangement of the chromosomes at the 
heterotypic division, x 196. 5. The embryo sac with two nuclei, with the curious 
thickening above, x 196. 6. Embryo sac showing two nuclei with the vacuole, 
x 196. 7. Division of two nuclei into four, x 196. 
