Meiotic Nuclear Divisions of Galtonia candicans. 755 
EXPLANATION OF PLATES LIX—LXIII. 
Illustrating Miss Digby’s paper on the Nuclear Divisions of Galtonia candicans. 
All the figures were drawn with the camera lucida under a 2 mm. apochr. Horn. imm. Zeiss, 
N.A. 1*40 with comp. oc. 18. X2250. 
Figs. 1-14. Somatic divisions in the root. 
Figs. 15 and 16. Divisions in the wall of the ovary. 
Figs. 17-27. Premeiotic divisions of archesporium. 
Figs. 28 and 29. 1 Crystalline ’ structures, and nucleolar division in root. 
Figs. 30 and 31. Telophase of last archesporial division. 
Fig. 33. Prophase in tapetum. 
Figs. 33-73. Heterotype divisions. 
Figs. 74-83. Homotype divisions. 
PLATE LIX. 
Fig. 1. Root. Chromosomes collecting on the equatorial plate. Note the different degrees of 
longitudinal fission. The nucleolus has been thrown out. 
Fig. 2. Polar view of equatorial plate. The small chromosomes are arranged in the centre. 
Fig. 3. The chromosomes are beginning to split on the equatorial plate. 
Fig. 4. The chromosomes have nearly separated. The small chromosomes are in advance of 
the others. 
Fig. 5. The chromosomes have separated. Note the fine connexions that join them. 
Fig. 6 A. Telophase. Showing the alveolization of the chromosomes and the consequent 
parallelism of their sides. 
Fig. 6 B. Late telophase which has passed into the ‘ resting ’ stage. The linin has broken up 
into small rounded particles. 
Fig. 7. ‘ Resting’ stage. The linin network is confined to the periphery of the nucleus. 
Fig. 8. Early prophase showing the parallel rows of linin granules. Condensing to form con¬ 
centrated portions of ‘ chromosome bands ’. 
Fig. 9. Still further approximation of the paired linin strands. Fine connexions join the 
strands to one another. 
Fig. 10. Slightly later stage in the concentration of the strands. Note the alveolization in the 
strands, and the longitudinal fission which arose as the space between the condensing strands. 
Fig. 11. Nucleus showing uneven concentration of the linin resulting in a corkscrew-like 
spireme. 
Fig. 12. Late prophase showing spireme segmented into chromosomes with most marked 
longitudinal fission. 
Fig. 13. Definite chromosomes. The chromosome (V) has already split, forming a widely 
extended V. Note the fine connexions. 
Fig. 14. Longitudinally split chromosomes collecting in the centre of the nucleus. Cytoplasmic 
radiations have appeared prior to the formation of the spindle. 
Fig. 15. Wall of ovary. Diaster. 
Fig. 16. Late diaster ; the chromosomes have lost their individuality. 
Fig. 17. Archesporium. Telophase. A cell-plate is forming, the chromatin mass is beginning 
to loosen out. 
Fig. 18. Polar view of a nucleus in telophase, showing the breaking up of the chromosomes, and 
the fragments united by fine connexions. 
Fig. 19. Superficial section of a nucleus in telophase, showing the alveolization of the chromo¬ 
somes. 
PLATE LX. 
Fig. 20. Later telophase. The alveclized portions of chromosomes are breaking up into parallel 
rows of granules. 
