Reed . — The Nature of the Double Spireme in A Ilium Cepa. 28 1 
Fig. 23. Anaphase, pairing well seen in lower group. ‘ Hooked ’ chromosome ( x ) also shown, 
x 1450. 
Fig. 24. Similar to Fig. 23 with ‘hooked’ chromosome ( pc ), also showing commencement of 
longitudinal fission. The four large dots represent the arms of a pair of chromosomes cut transversely, 
x 1450. 
Figs. 25, 26. Telophases, lateral fusions between chromosomes effected, and pulling out of the 
‘slits’, x 1450. 
Fig. 27. Later telophase, x 1450. 
Fig. 28. Polar view of telophase, showing the sixteen chromosomes and nucleolar knot with 
characteristic nucleolar vacuole, x 1450. 
PLATE XIX. 
Fig. 29. Pollen-grain nucleus. ‘ Roof’ of nucleus, showing the split spireme, x 1450. 
Fig* 3 °* Older pollen -grain nucleus with well-marked split spireme, x 1450. 
Fig* 31* Generative nucleus with longitudinally split spireme. x 1450. 
Fig. 32. Prophase of pollen-grain nucleus with split spireme, x 1450. 
Fig. 33. Later spireme in pollen-grain, x 1450. 
Fig- 34- Portion of pollen-grain nucleus with one chromosome longitudinally split, x 1450. 
Figs. 35-36. Generative nucleus of pollen-grain surrounded by vacuole and sheath of cytoplasm, 
x 1450. 
