33o LESTER W. SHARP 



FIG. 14. Prophase. Détails of splitting; c, vacuoles occurring exceptionally 

 late. a, b, c, str. Flemming ; d, e, Bexda (Page 3i5). 



FIG. 15. Prophase. Heavy cross pièces between lighter halves of split thread 

 at a. Benda (Page 3i5). 



FIG. 16. Prophase. Split complète in threads of var3-ing thickness. Str. 

 Flemming (Page 3i5). 



FIG. 17. Prophase. Later stage. Threads thickened and full}' equalized. Split 

 very clear. Benda (Page 3i5,\ 



FIG. 18. Prophase Détail from nucleus like fig. 17, showing anastomoses. 

 Benda (Page 3i6). 



FIG. 19. Prophase. Spirem stage in peripheral cell. Split very clear. Str. 

 Flemming (Page 3i6). 



FIG. 20. Prophase. Spirem stage in central cell. Split obscure but présent. 

 Benda (Page 3i6). 



FIG. 21. Prophase. Nucleus cuntracted ; chromosomes closely grouped with 

 halves tightly pressed together. Str. Flemming (Page 3i6). 



FIG. 22. Metaphase. Chromosomes arranged on spindle with halves superposed. 

 End insertion. Str. Flemming (Page 3oo). 



FIG 23. Metaphase. .Single chromosome showing well the anastomoses. Weak 

 Flemming (Page 3oo). 



FIG. 24. Metaphase. Long chromosome inserted at middle point. Str. Flemming 

 (Page 3oi). 



FIG. 25. Metaphase. Lower chromosome inserted at point intermediate between 

 middle and end. Str. Flemming (Page 3oi). 



FIG. 26. Early anaphase. Daughter chromosomes beginning to separate at 

 point of insertion. Str. Flemming (Page 3oi). 



FIG. 27. Early anaphase. Long chromosome with médian insertion beginning 

 to separate. Bouin (Page 3o2). 



FIG. 28. Anaphase. L^aughter chromosomes more widely separated, with points 

 of attachment equidistant from equatorial plane. Benda (Page 3o2). 



P"IG. 29. Anaphase. Later stage. Str. Fle.mming (Page 3o2). 



FIG. 30. Anaphase. Long chromosome with médian insertion. Str. Fle.mming 

 (Page 3o2). 



FIG. 31. Anaphase. Anastomoses between daughter chromosomes in four cases. 

 Benda (Page 3o2). 



