IWV 6 1895 
JOURNAL 
OF THE 
ROYAL MICROSCOPICAL SOCIETY. 
OCTOBER 1895. 
TRANSACTIONS OF THE SOCIETY. 
XII . — On the Division of the Chromosomes in the First Mitosis in 
the Pollen-Mother-Cell of Lilium. 
By Prof. J. Bretland Farmer, M.A. 
(Communicated by Prof. F. Jeffrey Bell, M.A., Sec. R.M.S.) 
{Read 1 6th October , 1895.) 
Plate X. 
In a paper read before the Society on May 15th of this year,* Miss 
Sargant discusses the. origin of the peculiar appearances presented by 
the chromosomes in Lilium Martagon during the first (heterotype) 
mitosis in the pollen-mother-cell. She deals especially with the 
question as to how the shape of the daughter-chromosomes in 
the diaster stage is derived from that of the mother-chromosome, 
and endeavours to explain the curious forms exhibited at that time as 
EXPLANATION OF PLATE X. 
[E signifies in all cases the ends of the elliptical chromosome, or the free ends when 
the primary fission is complete,] 
Fig. 1. — Diagram of a nucleus with four chromosomes illustrating some of the more 
common forms of these structures. 
„ 2. — The common mode of attachment of the “ ring ’’-chromosome to the spindle 
fibres. 
„ 3. — Some common forms of chromosomes seen from the pole when in the aster 
stage. S A, spindle axis. 
„ 4. — Later stage of fig. 2. 
„ 5. — Still later stage, in profile. 
„ 6. — The same, in front view. 
„ 7. — Front view of a chromosome dividing to give rise to the daughter-chromo- 
somes. 
„ 8. — Another mode of attachment of the ring-chromosome to the spindle. There 
is no bending, and the chromosome is attached near one end. 
„ 9, 10, 11. — Chromosomes whose limbs have crossed over each other. 
„ 12. — An unusual form, where the longitudinal halves of the chromosomes have 
become twice twisted. 
„ 13. — Later stage of 12. 
2 L 
1895 
* See ante , p. 283. 
