STUDIES OF THE DEVELOPMENT OF PEPEROMIA HISPIDULA 379 
dently come from an archesporial pair like that shown in figure 114, 
one of which has given rise to a sac with four megaspore nuclei, while 
the other has six nuclei in it. Sometimes the disparity in rate of 
Fig. 113. Longitudinal section of a young ovule containing 2 or possibly 
more, embryo sac mother-cells in a transverse row. X400. 
Fig. 114. Similar section showing 2 mother-cells in the axis of the ovule, the 
lower one in synapsis. X600. 
Fig. 115. Similar section with 3 mother-cells on the same axis. X400. 
Figs. 116, 117. Similar sections of the type shown in figure 113. X400. 
Fig. 118. Similar section of the type of abnormal sac shown in figure 114. 
The upper sac has but 4 nuclei while the lower has 6. X400. 
Fig. 119. A slightly oblique longitudinal section of a later phase of the same 
type. One sac has 8 nuclei, the other is uninucleate. X400. 
Fig. 120. Longitudinal section of nearly mature embryo sacs, one with 15, 
the other with 16 nuclei. These are numbered in the order of appearance of their 
nuclei in focus. X400. 
Fig. 121. Similar section of a mature embryo sac, containing but 14 nuclei 
altogether. X400. 
