3] 
Sister nuclei are the synergids, the other two being the egg 
and the upper polar nucleus. .. .- = p04 
- Often the development of this: group is affected by a 
reduction in the number of nuclei. Theoretically an increase 
should be possible: as well, but instances of a-regular occurence 
‘of more than four nuclei are not known. - | 
-The reduction series is worked out in figure 5, the number 
ti iy coe wee i ane 
os Ss Sr Ss 
=) a 2 E 2 
i ae ° 
ry ' on 
‘mn Sx = 
Ss it 5 DD ye 
oe ae =) 
2 3a 39 
8 2.5 ge et 
sae : “ Co) a 
2 pa [0 J---=- ‘Type I 
fied egg, 2 synerg., 
upper polar nucl. 
@ 
weoee Type Ila 
egg, 2 synergids. 
Type Ib 
egg, 1 synerg., 
upper polar nuel. 
Type Ila 
egg, 1 synergid, 
Type IIb 
egg, upper pol. nucl. 
Fig. 5. Reduction of the micropylar group. 
of nuclei ranging from four to one. A further reduction should 
‘not be possible, for the character of the gametophyte resists 
against total suppression’ and requires at least one nucleus : 
the egg. When four. nuclei are. present, one is the egg, one 
the upper polar nucleus and two -are synergids (fig. 5 1). 
Three nuclei may be either the egg and two synergids (fig. 5 
