358 BOTANICAL GAZETTE [NOVEMBER 
Fic. 21.—Similar anaphase, with the aster appearing unusually early. 
Fic. 22.—Connecting fibers withdrawn ; 
Fic. 23.—Spindle breaking apart in the middle. 
Fic. 24.—Radiations from the chromatic mass just beginning to appear at 
the lower pole; at the upper pole the focus has shifted out beyond the chromatin. 
Fic. 25.—A stage in the development of the aster intermediate between the 
two poles of the spindle shown in jig. 24 
Fic. 26.—Aster strongly developed, weiile the chromatin remains extremely 
closely condensed; from the same cyst as jig. 24. 
Fic. 27.—Chromatin beginning to enlarge to form karyosome. 
Fic. 28.—Karyosome rounded off; nuclear vacuole just appearin 
1G. 29.—Rays of aster beginning to bend around the vacuole to heat nuclear 
membrane; nucleolus and remnant of spindle lying below daughter nucleus. 
1G. 30.—Rays of aster nearly surrounding the nuclear cavity; karyosome 
passing into spirem of the next mitosis; cf. fig. 2 
Fic. 31.—A vegetative nucleus with the old ster lying along side. 
PLATE XVIII 
Fic. 32 Seine of a primary nucleus with halo and disintegrating nucleolus. 
1G. 33.—T wo sporangia from a newly segmented summer sorus, showing 
the character of the mitoses and the independence of the segments. 
1G. 34.—A spindle of one of the last mitoses of the sporangia. 
Fic. 35.—a, group of spindles formed by the division of a cluster of nuclei 
formed by amitosis, which lies in the center of a large cyst, the periphery of which 
contains the spindles of many small nuclei (b) derived by gemmation. 
Fic. 36.—Amitosis by constriction in a primary cyst, showing very great 
differences in chromatin content of daughter nuclei. 
Fic. 37.—An amitotic spirem in preparation for nuclear gemmation 
Fics. 38-40.—Amitosis by constriction and by nuclear gecuanation in the 
same Sis 
G. 41.—a, two amitotic nuclei; 6, an adjacent nucleus in spirem, which 
ee undoubtedly amitotic resembles mitotic spirems of figs. 4, 6; ¢ @ cluster 
of amitotic nuclei from the same section. : 
1G. 42.—A spindle with five chromatin bodies, presumably chromatin 
granules of the spirem not yet fused into chromosomes; cf. fig. II. 
