JULY mi.] KUWADA.—MATOSrS IN THE P. M. C. OF ZEA MAYS L. 181 



Fig. 20a — b — c. ' Sugar corn,' Three consecutive sections in side 



view. X 2360. 

 Fig. 21a— b. The same. Two consecutive sections at the multipolar 



stage. X. 3300. 

 Fig. 22a— b. ' Early eight sugar corn.' Two consecutive sections 



at the multipolar stage, showing 12 gemini. x 3300. 

 Fig. 23a— b. The same, showing 9 gemini. x 3300. 

 Figs. 24 —26. The red sugar corn. 

 Fig. 2ia — b. Two consecutive sections, showing 10 gemini between 



which a large nucleolus is found. X 3300. 

 Fig. 25. Somewhat similar stage showing a giant gemini. All 



chromosomes, only 9 in number, observed in one section. 



X 3300. 

 Fig. 26. Another case of the giant gemini. a — b two consecutive 



sections showing 9 chromosomes. X 3300. 

 Figs. 27-33. ' White flint.' 

 Figs. 27—98. Nuclei at the interkinesis, showing 10 chromosomes. 



X 3000. 

 Figs. 29—30. Both showing arrangement of chromosomes in the 



sister nuclei at the homotype division. X 3300. 

 Fig. 31a — b. The same showing 9 chromosomes, of which one is 



found to be extraordinarily large ; a, showing complete figure ; 



b, the giant chromosome only, x 3300. 

 Figs. 32—33, The quite young nuclei formed after homotype di- 

 vision, each showing 10 chromosomes, x 3000. 

 Fig. 34. Photograph of mature pollen grains with abortive ones. 



X 110. 



