468 
J. Osawa 
Figs. 24, 25. The nucleus of the embryo-sac-mother-cell, showing paired threads. 
Fig. 26. The same in dolichonema stage. 
Fig. 27. Embryo-sac-mother-cell, containing the nucleus of more advanced stage. 
Fig. 28 a, b. The nucleus of the embryo-sac-mother-cell, cut in two serial sections, 
showing longitudinal Splitting and cross-segmentation of the spirem. 
Fig. 29. The same, showing long bent rod-like chromosomes, which present 
several twisted forms. 
Fig. 30 a, b. The same, cut in two serial sections in more advanced stage, showing 
eight double chromosomes. 
Figs. 31a, b and 32. The same in diakinesis stage; eight chromosomes are 
clearly observable. 
Fig. 33 a, b. Side-view of the heterotypic spindle of the embryo-sac-mother- 
cell, showing eight double chromosomes, which arrange regularlv in the equatorial plate. 
Fig. 34. Embryo-sac-mother-cell in the anaphase of the first division. 
Fig. 35. The same in the telophase of the heterotypic mitosis. 
Fig. 36. The same in later stage. 
Fig. 37. Metaphase of the second mitosis of the embryo-sac-mother-cell. 
Fig. 38. A row of four megaspores. 
Fig. 39. Two-nucleated embryo-sac with large vacuoles. x 1300. 
Fig. 40. Four-nucleated embryo-sac. x 900. 
Fig. 41. Mature embryo-sac, showing oosphere, one synergid, primarv endosperm 
nucleus and partly degenerated antipodal cells. x 600. 
Fig. 42. The nucleus of the pollen-mother-cell in resting condition. 
Fig. 43. The same in later stage. 
Fig. 44. The same in svnapsis. 
Fig. 45. The same in more advanced stage. 
Fig. 46. The same, showing spirem-tlireads. 
Fig. 47. The same, showing more thickened spirem, in which cross-segmentation 
into chromosomes has already begun. 
Figs. 48, 49. The same in more advanced stage, showing long rod or spindle- 
shaped chromosomes, where their pairing is scarcely observable. 
Fig. 50 a, b. A pollen-mother-cell, cut into two serial sections, showing diakinesis 
stage. 
Fig. 51. The same in early prophase of the first division, showing multipolar 
spindle. 
Fig. 52. The same, showing polar view of the equatorial plate in the metaphase 
of the first mitosis. 
Plate XXXVIII. 
Fig. 53. The samfe, showing side-view of the same spindle. 
Fig. 54. The same, showing anaphase of the first division. 
Fig. 55. Pollen-mother-cell, containing two spores, resulting from the first 
mitosis. x 900. 
Fig. 56. The same, showing side-view of the heterotypic spindle. 
Fig. 57 a, b. The same, cut in two serial sections, showing the anaphase of the 
heterotypic spindle; the movement of the daughter-chromosomes towards the poles 
of the spindle is very irregulär. 
Fig. 58. The same in telophase. 
