854 Fraser and Snell .— The Vegetative 
9 . Livingston, B. E. (’ 03 ): The Role of Diffusion and Osmotic Pressure in Plants. Decennia 
Publications of the University of Chicago. 
10 . Merriman, M. L. (’ 04 ) : Vegetative Cell Division in Allium. Bot. Gaz., vol. xxxvii, p. 178. 
11. Nemec, B. (TO): Das Problem der Befruchtungsvorgange und andere cytologische Fragen. 
Berlin, Gebriider Borntraeger. 
12 . Overton, J. B. (’ 09 ): On the Organization of the Nuclei in the Pollen Mother-cells of certain 
Plants with especial Reference to the Permanence of the Chromosomes. Ann. Bot., 
vol. xxiii, p. 19. 
13 . Stomps, T. J. (TO) : Kerndeeling en Synapsis bij Spinacia oleracea, L. Amsterdam. 
14 . Sykes, M. G. (’ 09 ) : Note on the Nuclei of some Unisexual Plants. Ann. Bot., vol. xxiii, p. 341. 
15 . Tahara, M. (TO) : Ueber Kernteilung bei Morus. Bot. Mag., Tokyo, vol. xxiv, p. 281. 
EXPLANATION OF PLATES LXII AND LXIII. 
Illustrating Dr. Helen Fraser’s and Mr. Snell’s paper on Vegetative Divisions in Vicia Faba. 
All figures were drawn with a camera lucida under a 2 mm. apoch. horn. imm. Zeiss N.A. 
1.40 comp., oc. 12. Magnification x 2,000 throughout. 
PLATE LXII. 
Fig. 1. Root; late anaphase, showing segmented chromosomes. 
Fig. 2. Ovary; telophase, chromosomes contracted. 
Fig. 3. Stamen; loosening of aggregation of chromosomes; cross attachments formed; 
longitudinal fission begun. 
Fig. 4. Root; later stage of same. 
Fig. 5. Root; same, still later. 
Fig. 6. Root; early reticulum. 
Fig. 7. Root; early reticulum; nucleolus present. 
Fig. 8. Root; reticulum in upper nucleus; in lower (sister) nucleus spireme formation has 
already begun. 
Figs. 9 and 10. Root; 4 resting’ stages. 
Fig. 11. Root; breaking down of cross connexions in formation of spireme. 
Fig. 12. Root; early spireme, showing relation to nucleolus. 
Fig. 13. Root; same, rather later. 
Figs. 14 and 15. Root; later stages of spireme ; disappearance of nucleolus. 
Fig. 16. Root; beginning of segmentation of spireme. 
Fig. 17. Root; tangential section of nucleus, showing newly formed chromosomes. 
Fig. 18. Root; chromosomes passing on to spindle. 
Fig. 19. Root; chromosomes attached to spindle by one end, and for the most part lying 
parallel to it. 
Fig. 20. Root; individual chromosomes on spindle, (a) cross attachment between members of 
a pair of daughter chromosomes; (b) and (c) early stages of separation of daughter chromosomes. 
Fig. 21. Root; metaphase. 
Fig. 22. Root; later stage of same. 
Fig. 23. Root; early anaphase, showing segmented chromosomes. 
Fig. 24. Young pollen-grain in transverse section; ‘resting’ nucleus, longitudinal fission 
visible in threads of reticulum. 
