549 
Cytology of the A setts. 
Fig. 8. First division in ascus, equatorial plate showing eight chromosomes, x 1900. 
Fig. 9. First anaphase, x 1900. 
Fig. 10. Second metaphase, x 1900. 
Fig. 11. Second anaphase, x 1900. 
Fig. 12. Third metaphase, x 1900. 
Fig. 13. Third anaphase, four chromosomes passing to each pole. X 1900. 
Ascobolus furfuraceus. 
Fig. 14. Mitosis in ascogenous hypha. x 1900. 
Fig. 15. Definitive nucleus of ascus, stage of first 1 contraction’, x 1900. 
Fig. 16. Later stage of same; spireme beginning to spread through nuclear area, x 1900. 
Fig. 17. Definitive nucleus of ascus ; duplication of spireme, x 1900. 
Fig. 18. Definitive nucleus of ascus; formation of loops of second contraction phase, x 1900. 
Fig. 19. Gemini of heterotype prophase, x 1900. 
Fig. 20. Later stage in development of spindle of first mitosis ; eight chromosomes, x 1900. 
Fig. 21. First metaphase ; gemini on spindle, x 1900. 
Fig. 22. First anaphase, x 1900. 
Fig. 23. First telophase ; around the centrosome is a dense area separated by a vacuolate space 
from the rest of the cytoplasm. X 1900. 
Fig. 24. Second prophase ; chromatin lying to one side of the nuclear area ; an unusually 
large ascus. X 1900. 
Fig. 25. Second metaphase, x 1900. 
Fig. 26. Second anaphase, x 1900. 
Fig. 27. Third prophase; lateral aggregation of chromatin, x 1900. 
Fig. 28. Later stage of same; from ascus visible in same field of microscope as that of 
Fig. 27. x 1900. 
Fig. 29. Third metaphase, x 1900. 
Fig. 30. Third anaphase ; four chromosomes passing to each plate, x 1900. 
Fig. 31. Third mitosis; late telophase showing nuclear beak, centrosome, and aster, x 1900. 
Fig. 32. Later stage ; development of lines of cleavage in connexion with vacuoles in cytoplasm. 
X 1900. 
Fig. 33. Same; later stage, x 1900. 
Figs. 34, 35. Same; still later stages, x 1900. 
Fig. 36. Young spores in ascus; inner spore wall is nearly complete; outer wall is defined by 
limiting layer of cytoplasm beyond old line of cleavage, x 1 900. 
Lachnea stercorea. 
Fig. 37. Division in ascogenous hypha. x 1900. 
Fig. 38. Definitive nucleus of ascus ; stage of first 1 contraction ’. x 1900. 
Fig. 39. Definitive nucleus of ascus ; longitudinally split spireme, x 1900. 
Fig. 40. Second contraction ; the four loops show longitudinal fission in places, x 1900. 
Fig. 41. Later stage of same; two loops appear long and two short, x 1900. 
Fig. 42. First prophase ; four gemini. x 1900. 
Fig. 43. First prophase ; passage of contracted gemini on to spindle, x 1900. 
Fig. 44. First metaphase, x 1900. 
Fig. 45. First anaphase ; four chromosomes travelling to each pole, x 1900. 
Fig. 46. Second metaphase ; section parallel to long axis of ascus. x 1900. 
Fig. 47. Second anaphase ; ascus is cut obliquely so that nuclear area is viewed at about right 
angles to that of Fig. 46. x 1900. 
Fig. 48. Third metaphase ; one of the nuclei is shown in polar view, x 1900. 
Fig. 49. Third telophase ; in the second nucleus from the top one of the chromosomes appears 
shorter than the other, x 1900. 
Fig. 50. Early stage of spore formation, showing nuclear beak centrosome, radiations, and 
near one of the asters, a vacuolate area, x 1900. 
Fig. 51. Same; more advanced stage, x 1900. 
Fig. 52. Delimitation of spores; vacuolate lines, comparable to the lines of cleavage in 
Ascobolus , are present between the aster and the epiplasm. x 1900. 
P p 2 
