498 
Harper—Nuclear Phenomena in the Smuts. 
EXPLANATION OF FIGURES. 
All figures drawn with aid of Abbe camera lucida and with 
Zeiss apochromatic objective 2 m.m., aperture 1.40. Figs. 1-10, 
12, and 17-22 with compensating ocular 12, the others with 
compensating ocular 18. 
PLATE VIII. 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Fig. 11. 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
Fig. 16. 
Fig. 17. 
Fig. 18. 
Fig. 19. 
Fig. 20. 
Fig. 21. 
Fig. 22. 
Figures 1-7, Ustilago scabiosae. 
Promycelium with resting nucleus. 
- with nucleus in equatorial plate stage of division, 
nucleole lying near one end of spindle. 
- with daughter nuclei in dispirem stage, connected 
by spindle fibres. 
- with two daughter nuclei not fully developed but 
widely separated. 
-- with four resting nuclei. 
Four celled promycelium with conidia. 
Upper cell of four celled promycelium. Nucleus in 
equatorial plate stage. 
Figures 8-22, Ustilago antherarum. 
Germinating spore uninucleate. 
Germinating spore after first nuclear division. 
Promycelium with first septum. 
Conidium budding like yeast. 
PLATE IX. 
Three-celled yeast-like colony. 
Four-celled yeast-like colony. 
Conidium with nucleus in equatorial plate stage. 
Conidium with nucleus in metaphase. 
Conidium with nucleus in dispirem stage, spindle still 
present. 
Conidia fused in pairs and swollen. 
Conidia fused in pairs, curved fusion tube. 
Promycelium cells with fusion tube. Apical cell in 
process of disorganization. 
Promycelium with apical cell fused with adjacent coni¬ 
dium; fusion tube of lower pair lies behind them. 
Fused pair with one germinating in tube. 
Fused pair with conidial buds. 
