1898] POLVYEMBRYONY AND ITS MORPHOLOGY 225 
third case I have found is represented in fig. 1g, which is 
more advanced than fig. 77, and where the differentiation of the 
richly protoplasmic cells of the embryonic mass from the nearly 
empty cells beneath it is fairly sharp, but nevertheless the rela- 
tions of the two kinds are still sufficiently close to show the 
origin of the one from the other. Another section of the same 
specimen shows a similar connection of the other mass of 
embryonic tissue with the nucellus. 
From these cases it is clear that in this species the embryos 
of both positions arise from the nucellus, and in this respect agree 
with Funkia, Nothoscordum, Citrus, and others, the usual method. 
A synopsis of the modes of origin of polyembryony is 
given by Tretjakow, which in synopsis, with the additions made 
by others, and excluding cases due to branching of the nucellus, 
mon of two ovules, presence of two or more embryo sacs in 
me nucellus, etc., are as follows: From cells of nucellus near 
the micropyle, Funkia and others (Strasburger) ; froma second 
“88 cell, Santalum, or from its doubling Sinningia (Strasburger) ; 
from synergids, Mimosa Denhartii (Guign ard) _ Iris Sibirica (Dodel), 
= Pethaps in Lidinm Martagon (Overton) ; from the antipodals 
and sy hergids, Allium odorum (Tretjakow) ; from the branching 
egg of tissue derived from the fertilized egg cell (Jeffrey ) ; 
‘ a egelmaier points out the occurrence in Allium odorum 
cells oS fi from egg cell, synergids, antipodals and nucellus 
* oy the Same species and individuals. There still remain 
eum = °rigins, endosperm and integument. In all known 
oa Celebogyne, the production of the new embryos 
“ear after fertilization, or at all events after the 
A "eh ati ee ; the significance 
of Biyenbe great interest now arises as to : g§ ee 
recalls a yony. Strasburger, though he mentions tha 
himself ) then recently discovered by Farlow, Pesci 
2 he referring to the extra embryos as usa 
~ that it ig pata Adventivkeime.” Pfeffer’ has suggeste 
ae acase of budding, and that the specific conditions 
“enphysiologie 1# 29. 1897. 
