444 BOTANICAL GAZETTE [DECEMBER 
Fic. 65a. The nucleus of jig. 65 under higher magnification. 
Fic. 66. The polar view of the stage shown in the previous figure; 20 chromo- 
somes clearly present. 
F 7. Late metaphase. 
Fic. 68. Anaphase; vacuole intruding between the two groups of daughter 
chromosomes. 
Fic. 69. Later stage of anaphase. 
Fic. 70. Lower nucleus passing into resting condition. 
Fic. 71. Cleavage furrow separates the sperm above from the sperm mother 
cell which is destined to produce later a second sperm. 
Fic. 72. Sperm almost formed; the sperm mother cell beginning to elongate, 
preliminary to the development of a second sperm 
Fic. 73. Side view of mature sperm 
Fic. 74- Sperm viewed from above; } maintaining their individual 
forms. 
Fic. 74a. Portion of fig. 74 under higher magnification. 
Figs. 75-81. Formation oj the second sperm. 
Fic. 75. Prophase of mitosis to form second sperm; the first sperm still present 
at the side, so that the sperm mother cell assumes an asymmetrical outline. 
Fic. 76. Metaphase showing equatorial plate; centrosphere-like structures 
present. 
Fic. 77. Polar view of same stage as in previous figure. 
1G. 78. Late metaphase. 
Fic. 79. Anaphase. 
Fic. 80. Later anaphase; vacuole between the two groups of daughter 
chromosomes. 
Fic, 81. Cleavage furrow separating the second sperm from the sperm mother- 
cell. 
PLATE XXIiI. 
The formation of the procarp. 
Fic. 82. Mitotic figure in the cell of the central siphon of a procarp, to form 
the first peripheral cell; centrosphere-like structures present. 
Fic. 83. Polar view of the same mitosis, showing 20 chromosomes. 
Fic, 84. First peripheral cell is formed. 
Fic. 85. Mitosis to form second peripheral cell. 
Fic. 86. Polar view of the same mitosis; 20 chromosomes present. 
Fic. 87. Anaphase of the same mitosis. 
Fic. 88. The fifth peripheral cell, called the pericentral cell, formed on the 
left of the central siphon; this cell is destined to develop the carpogonial branch. 
Fic. 89. Mitosis to form first cell of the carpogonial branch from the peri- 
central cell. 
Fic. 90. Polar view of the same stage as the previous figures, showing 20 
chromosomes. 
