PLATE XV 



The Centromere at Meiosis 



Fig. I. — Pachytene : Agapanthns iimhellatiis (9 and 2 o'clock). 

 Navashin-brazilin preparation given to the author by the late Dr. 

 Belling. X 2700. 



Fig. 2. — Diplotene : Fritillaria Elwesii. Chiasma on each side of 

 the centromeres of an AI bivalent (9 o'clock). Flemming — gentian- 

 violet. X 1600. 



Fig. 3. — First anaphase in Alstrcemeria dividing univalent lagging 

 on the equator shows its two centromeres. (La Cour, unpublished, 

 aceto-carmine fixation.) 



Fig. 4. — First metaphase bivalent of Galtonia candicans with two 

 terminal chiasmata. (La Cour : 2B.E. and gentian-violet.) 



Figs. 5 and 6. — First metaphase in Tradescantia bvacteata pre- 

 treated with nitric acid. Flemming — gentian-violet. Polar view 

 shows five of the six centromeres at one level, side view two pairs and 

 one of a third pair. (La Cour, unpublished, Fig. 152.) 



