641 
the Meiotic Divisions of Vicia Faba. 
9. Each of the gemini is attached to the spindle by one end (Fig. 19). 
The two constituent chromosomes move apart along the spindle fibres, but 
remain for a while in contact at their free end (Figs. 19, 20). 
10. As they separate the longitudinal fission in each becomes distinct 
(Figs. 2i, 22). The chromosomes travel up the spindle as V-shaped 
structures attached by the apex of the V (Figs. 23, 24). 
11. At the pole of the heterotype spindle the chromosomes become 
united laterally, and sometimes end to end, by cross connexions 
(Figs. 25, 26). 
12. When these break down they elongate ; they retain their individu- 
ality and their V-form (Fig. 27). 
13. They pass as V’s on to the homotype spindle (Fig. 28), and there 
the limbs of the V separate, going to different poles, so that the longitudinal 
fission, begun in the last premeiotic telophase, is at last completed ; the 
daughter chromosomes have the form of rods as in a vegetative division 
(Fig. 39). 
14. At the pole of the homotype spindle the chromosomes become 
united (Figs. 30, 31), both laterally and end to end. Longitudinal fission 
takes place in them, and the reticulum of the spore nucleus is produced, 
and shows a diamond-shaped mesh similar to that of other vegetative 
nuclei (Fig. 32). 
Bibliography. 
1. Digby, L. (’09) : Observations on Chromatin Bodies. Ann. Bot., xxiii, p. 491. 
2. Farmer, J. B., and Moore, J. E. S. (’05) : On the Meiotic Phase (Reduction Division) in 
Animals and Plants. Q. J. M. S., vol. xlviii, p. 489. 
3. Farmer, J. B. (’12) : Telosynapsis and Parasynapsis. Ann. Bot., vol. xxvi, p. 623. 
4. Fraser, H. C. I., and Snell, J. (’ll) : The Vegetative Divisions in Vicia Faba. Ann. Bot., 
xxv, p. 845. 
5. Lawson, A. A. (’ll) : The Phase of the Nucleus known as Synapsis. Trans. Roy. Soc. Ed., 
vol. xlvii, p. 591. 
6. (’ll) : Nuclear Osmosis as a Factor in Mitosis. Trans. Roy. Soc. Ed., 
vol. xlviii, p. 137. 
7. (’12) : A Study in Chromosome Reduction. Trans. Roy. Soc. Ed., vol. xlviii, 
p. 601. 
8. Muller, H. A. C. (’09) : Ueber karyokinetische Bilder in der Wurzelspitze von Yucca. 
Jahrb. f. wiss. Bot., vol. xlvii, p. 103. 
9. (’12) : 'Kernstudien in Pflanzen. Archiv fur Zellforschung, vol. viii, p. 1. 
10. Reed, T. (’14) : The Nature of the Double Spireme in Allium Cepa. Ann. Bot., vol. xxviii, 
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