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473
the division, in the heterotypie anaphase, of one of the unpaired
chromosomes. Probably both unpaired chromosomes sometimes
divide although no P. M. C. have been seen with ten chromosomes
as
—_—— AEG,
ve
\ 2? 3 CL T
» s / b
M * ö FR
9 En
Ae e.49*
4 no oe
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ques dm $
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Is d’ | om 1
Fig. l. a and b Nicotiana alata, homotypic anaphases.
d, two plates containing 8 and two containing 10
chromosomes. c and d Nicotiana Tabacum var. “Mira-
dato“ X N. sylvestris, F,. c, heterotypic metaphase in
E. M. C, polar view, 12 bivalents and 12 univalents.
d’ and d?, heterotypic anaphase in P. M. C., 11 bivalent
partners at each pole and 1 undergoing separalion, 11
single chromosomes dividing and 1 undivided
in the equatorial region.
in all four anaphase plates. In view of these results further study
of this somewhat polymorphic species is necessary. Most commonly
all four anaphase plates contain nine chromosomes and undoubt-
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