PLATE I 



The drawings for these figures were made mostly at magnifications of from 1800 to 

 2400. The reproduction here given is about two-thirds the size of the originals. All 

 figures are of the Hemerocallis fulva clon Europa : — 



Pig. 1. — Equatorial plate of somatic division showing the normal number of 12 

 chromosomes. 



Fig. 2. — Anaphase of mitosis showing 12 daughter chromosomes passing to each pole. 



Fig. 3. — Anaphase of mitosis with much non-distribution. Only 5 chromosomes are 

 at one of the poles. 



Fig. 4. — Anaphase of mitosis with at least a total of 40 chromosomes. 



Fig. 5. — Anaphase of mitosis with a total of 5G chromosomes passing to poles 

 in groups of 26 and 30. 



Fig. 6. — A typical synapsis in pollen mother cells. 



Fig. 7. — Diakinesis with 4 bivalents and 4 univalents. 



Fig. 8. — Diakinesis with large and small chromatin masses, the total number being 

 at least 17. 



Fig. 9. — Diakinesis with at least 24 masses of chromatin of irregular sizes, some of 

 small size. 



Fig. 10. — Late diakinesis with 6 bivalents. The number of chromosomes is normal 

 and all are in pairs. 



Fig 11. — Polar view of equatorial plate of the first division of reduction showing 

 (> bivalents, or 12 chromosomes, arranged in (! pairs, a condition fully normal. 



Fig. 12. — Equatorial plate of first division with 6 bivalents all of which are in 

 the early stages of segmentation and fragmentation. 



Fig. 13. — Equatorial plate of first division of meiosis showing 5 bivalents and 2 

 univalents, and Fig. 14, a sister nucleus in same stage and at same magnification, 

 Showing 12 univalents all in process of dividing. 



Fig. 1.". — Equatorial plate of first division with bivalents showing considerable 

 fragmentation. 



Fig. 10. — Equatorial plate of first division witli much fragmentation. 



