Davis.—Cytological Studies on Oenothera. II. 651 
Fig. 56. Anaphase of the homotypic mitosis, showing the two sets of daughter chromosomes, 
seven in each set, that result from the separation of the members of the pairs. 
Figs. 57. Nucleus of megaspore, showing reticulum and deeply staining chromatic bodies 
(prochromosomes ?). 
Figs. 58-66. Illustrating the vegetative mitoses in the cells of the nucellus. 
Fig. 58. Resting nucleus, showing delicate reticulum, minute chromatic bodies, and large 
nucleolus. 
Figs. 59 and 60. The thickening of the strands of the reticulum preparatory to the formation of 
the spireme. 
Fig. 6r. The spireme giving evidence of segmentation to form the chromosomes. 
Figs. 62 and 63. Chromosome segments of the spireme. 
Fig. 64. The group of fourteen chromosomes at the equatorial plate viewed from above. 
Fig. 65. Anaphase of a vegetative mitosis ; the daughter chromosomes gathered at the poles of 
the spindle in the form of attenuated V’s. 
Fig. 66. Daughter nuclei; some of the chromosomes still recognizable as bands or threads, 
more numerous on the side of the nucleus farthest from the equatorial plate. 
