194 BOTANICAL GAZETTE [march 



Fig. 27. — Anaphase: two sets of daughter chromosomes proceeding toward 

 the poles. 



Fig. 28. — Late anaphase. 



Fig. 29. — Telophase of the first (heterotypic) division in the antheridium: 

 centrosomes faintly discernible. 



Fig. 30. — The antheridium after the first nuclear division: two daughter 

 nuclei in the resting condition; no centrosome. 



Fig. 31. — Prophase of second mitosis in the antheridium: two daughter 

 nuclei in similar stage; centrosomes present. 



Fig. 31a. — One of the two nuclei shown in fig. 31, under higher magnification: 

 chromosomes 32. 



Fig. 32. — Metaphase: two figures in the same condition. 



Fig. 32a.— One of the two nuclei shown in fig. 32, under higher magnification. 



F IG - 33- — Late anaphase: mitosis proceeding simultaneously in the two 

 nuclei. 



Fig. 34.— Late prophase of the third nuclear division in the antheridium: 

 four figures in similar condition. 



fig 



FlG - 35-— Metaphase, viewed from the pole: each of the 32 chromosomes has 



just split. 



Fig. 36.— Anaphase: the four nuclei in the same condition. 



Fig. 36a. 

 magnification: chromosomes 32. 



fig 



figu 



Fig. 37.— Late prophase of the fourth mitosis in the antheridium: eig 



res in the same stage. 



Fig. 37a.— One nucleus in late prophase from fig. 37, under higher magn 



iffht 



tion: chromosomes 32. 



figu 



Fig. 38.— Late prophase of the fifth mitosis in the antheridium: sixteen 



Fig. 38a.— One nucleus from fig 



chromo- 



somes 32. 

 Fig. 39 



antheridium 



figu 



Fig. 39a.— One nucleus from fig. 39 , under higher magnification: chromo 



somes 32. 



PLATE IX 



Mitoses 



Fig. 40.— Resting nucleus of the oogonium: chromatin showing ragge 



Cfrlirp sinrl mi/>L^l ',i . ....._ ^««trr»cnnie. 



structure and 

 Figs. 41a 



*^*Lnig nucleus 01 the oogonium: cnromaim aw— n 

 nucleolus without apparent connection with it; no centrosorne hase: 

 , 41&.— -Two sections of the same nucleus in very early pi°P ' 



transformed 



ance with a few radiations. 



has made its app»r 



Fig. 4 2.-Early stage of synapsis: centrosome with radiations not sho»n i 



this figure. 



