11-14. Bouquet-stage, showing two nucleoli, centrosome (c) in fig. 11, and loops made up of fine, then coarser granules.
15-17. Stage following preceding; loops straightened out and extending in various directions through nucleus.
18. a, Chromosomes much shortened and longitudinally split; b, chromosomes contracted to form diamond-shaped figures.
19. Stage between 18a and 18b.
20. Stage between 19 and 18b.
21. Stage similar to 18a, one chromosome in double diamond form.
22. First maturation spindle in metaphase, chromosomes in single and double diamond shapes.
23. Chromosome in single diamond or tetrad form, as they usually come into the spindle.
24. Double diamond-form assumed before metakinesis.
25. The 26 chromosomes of an early metaphase.