m V -TIIEJ^OTAmVALMAGAZINK vo, xxv.^o. 2H. 



V'-'S. '— , Chromosomenzahl. Flora, Bd. 100. 1910 ■ ■ - - 



Y ;"'Qi; , TiscHLER, G., Zellsttidien an sterilen Bastardpflanzeii. Arch. 

 -■,,./ f. Zqllforsch Ed. 1. 1908. - 



. lOt ' — , Untersuchungen iiber die Entwicklung des Bananen- 



P ' Pollens, I. Archiv f. Zellforsch. Bd. Y. 1910. . 



.11' Tahara, M , Ueber die Zahl der Chromosomen yon Crepls 

 ' ' .' japonica Bej^th. Bot. Mag. Tokyo. Vol. XXIY. 1910. 



EXPLANATION OF PLATE. 



All figures, are drawn with the aid . of Abbe's camera, and with a 



Zeiss' achromatic -^-^ objective and a comps. ocular 18 or an ordinary 



ocular 4, and reduced into J from the original magnifications given 



below. 



' I^ig. 1." Presynaptic stage in the pollen-mother-ceU-nucleus of Early 



eight sugar corn.' x 3000. - • ■ 



Fig. 2. Beginning of synapsis in the red sugar corn. X 3000. 



Fig. 3. S3mapsis in ' Early eight sugar corn.' X 3000. 



Fig. 4. The second contraction stage in the red sugar corn. 



X 3000. 

 Fig. 5. Segmentation of iiuclear threads in the red sug£ir corn. 

 X 3300. 

 ' Fig. 6. Diakinesis in 'Early eight sugar corn.' x 3000: 



Figs. 7 — 11. The red starch corn. 

 " Fig. 7a— b. Tw^o consecutive sections in side view of hctcrotype 



division, x 3300. - 



"■■ Fig. 8a— b. The same in a later stage, x 3300. 

 -^'Fig. 9a— b. Two optical sections of the same, x 3300. 



Figs. 10-11. Polar view. Fig. 10 somewhat earlier stage, a-b two 

 ' '^ °; Gonsecutive sections. X 3300, =: 



Figs. 12 — 19. ' Amber rice pop corn.' 

 i^oFig. 12a-^b. Two consecutive sections in side view, x 3300. 



Fig. 13a— b — e. Three - consecutive sections, somewhat later stage 

 --i> than Fig. 12. X 3300. -'/ 



.-/^g^ 1^. Polar view. X-3g00. -- 



Figs. 15—19. Abnormal case, x 3300. Fig. 15-17/ Polar view. 

 Fig. 18. Side. view. Fig. 19. Two segregated groups of chromo- 

 somes at the poles. - 



