Maiosis in the Pollen Mother Cells 

 of Zea Mays L, 



By 

 Yoshinari Kuwada. 



(With Plate V.) 



Zea Mays is a plant of double interest, firstly that it 

 comprises an innumerable number of races, indicating a strong 

 disposition to changes or variations, secondly that the pheno- 

 menon known as xenia was most well demonstrated by the 

 crossing of its races. So it was desirable to subject this plant 

 under a closer cytological examination. The races which I have 

 investigated were as follows : — 



Red starch corn* 



Yellow starch corn 

 ' Amber rice pop corn ' 



* Black starch ' 



' Golden broach field corn ' 



* White flint ' 



* Sugar corn ' 



* Early eight sugar corn ' 

 Red sugar corn. 



The materials were fixed mainly with the chrom-osmium- 

 acetic mixture and partly with the chrom-acetic mixture. The 

 microtome sections were made 7 /i thick. For thie staining in 

 general, Heidenhain's iron-alum-hgematoxylin, and in special 

 cases Flemming's triple-staining was used. 



Heterotype Division. 



The presynaptic condition of the nucleus in Zea Mays is 

 entirely similar with that of Oryza sativa (2). But due to the 



*The names of the races without inverted commas are those whose established 

 names are unknown, and their names above given are only provisional and indicae 

 some characters of the kernel. 



