228 FISHER: SEED DEVELOPMENT IN PEPEROMIA 
In the type illustrated by TEXT FIG. Ic, there are only four 
nuclear generations from the definitive archesporial cell to the 
mature sac. Since the first two of these nuclear divisions are 
followed by evanescent cell-walls, they may be regarded, as was 
pointed out above, as the equivalents of the first two cell-genera- 
tions in TEXT FIG. Ia. That is, they are to be regarded as mega- 
spore nuclei, and the mature embryo sac is the product of four 
megaspore nuclei, each megaspore nucleus dividing twice. 
In the type illustrated by TEXT FIG. Id, the definitive arche- 
sporial cell divides into an upper and a lower cell, of which the 
upper divides once more forming two potential megaspores, and 
the lower develops immediately, without the appearance of cell- 
walls, into an eight-nucleate embryo sac. Thus there are but four 
nuclear generations, from the definitive archesporial cell to the 
mature embryo sac, which is to be regarded as the product of 
the morphological equivalent of two megaspore nuclei. 
In the type illustrated by TEXT FIG. Ie, there are four genera- 
tions, one cell-generation and three nuclear generations, from th 
definitive archesporial cell to the mature embryo sac, which 
latter contains eight nuclei, and may be considered to be the pro- 
duct of the morphological equivalent of two megaspore nuclei, 
each dividing twice. 
In the type illustrated by TEXT Fic. If, there are four genera- 
tions, two cell-generations and two nuclear, from the definitive 
archesporial cell to the mature embryo sac. The sac here contains 
four nuclei and is clearly the product of one megaspore, which 
divides twice. 
In the type illustrated by TEXT FIG. 1g, there are three nuclear 
generations, from the definitive archesporial cell to the mature 
embryo sac, which latter contains eight nuclei, and may be con- 
sidered to be the product of the morphological equivalent of four 
megaspore nuclei, each dividing but once. 
In the type illustrated by TEXT FIG. 1h, there are three genera- 
tions, one cell-generation and two nuclear, between the definitive 
archesporial cell and the mature embryo sac, which latter contains 
four nuclei, and may be considered to be the product of the mor- 
phological equivalent of two megaspore nuclei, each dividing once. 
In the type illustrated by TEXT FIG. 11, the case is similar to 
