23 
Embryo of Ccphalotaxus driipacea . 
Fig. 19. A more highly magnified section of the central nucleus during spindle formation. The 
long chromosomes are sharply defined and one pole of the spindle is already indicated by the con- 
veying of the fibrils toward a definite point. The nuclear wall is partly broken down. May 26, 1904. 
Fig. 20. A longitudinal section of an archegonium with the central nucleus in an advanced 
stage of mitosis, the chromosomes being at the poles of the spindle. May 21, 1904. 
Fig. 21. The same spindle more highly magnified showing the character of the chromosomes 
and the absence of any cell-plate formation between the daughter-nuclei. May 21, 1904. 
Fig. 22. A longitudinal section of an archegonium showing the ventral canal nucleus and egg- 
nucleus fully organized and the absence of a membrane separating them. May 30, 1904. 
Fig. 23. A longitudinal section of the upper portion of an archegonium more highly magnified, 
illustrating the similarity of the ventral canal and the egg-nuclei and their relative position just after 
their organization. May 30, 1904. 
Fig. 24. A longitudinal section of two mature archegonia showing their relative position to 
the archegonial chamber above, and the character and extent of the jacket-cells. May 23, 1904. 
Fig. 25. A longitudinal section showing two pollen-tubes one of which has extended into the 
archegonium. May 30, 1904. 
Fig. 26. A longitudinal section of a mature archegonium just before fertilization showing the 
peculiar cytoplasmic centres in the region below the nucleus. May 26, 1904. 
Fig. 27. A longitudinal section showing the two sperm-nuclei still surrounded by the membrane 
of the body-cell and about to enter the archegonium. The egg-nucleus has enlarged considerably. 
May 26, 1904. 
Fig. 28. A longitudinal section showing one sperm-nucleus within the archegonium, the second 
sperm-nucleus was observed in the section immediately following. They were both within the wall 
of the body-cell. May 28, 1904. 
Fig. 29. A longitudinal section showing one of the sperm-nuclei approaching the egg-nucleus. 
Its path and rapid approach is indicated by the disturbed condition of the cytoplasm in its rear 
May 28, 1904. 
Fig. 30. A longitudinal section showing the actual union of one of the sperm-nuclei with the 
egg-nucleus while the second sperm-nucleus remains in the cytoplasm above. May 26, 1904. 
Fig. 31. A longitudinal section showing a similar condition with the enveloping of the fusing 
nuclei by the male cytoplasm. The sperm-nucleus enters the egg-nucleus without losing its 
spherical form. May 26, 1904. 
Fig. 32. A longitudinal section showing a little later stage in the fusing of the sex-nuclei; the 
male chromatin being in a less compact condition. May 28, 1904. 
Fig* 33- A section of the fusing-nuclei more highly magnified showing the difference in the 
structure of the male and female chromatin. May 26, 1904. 
Fig. 34. A longitudinal action showing the spindle of the division of the fusion-nucleus. The 
male cytoplasm forms a complete zone around the spindle, but some distance from it. May 23, 1904. 
Fig- 35- A more highly magnified section of the first spindle of the sporophyte showing the 
increased number of chromosomes as compared with those found in the gametophyte. May 23, 1904. 
Fig. 36. A longitudinal section showing the first two nuclei of the pro-embryo. They both lie 
embedded in a dense area of starch granules. May 23, 1904. 
Fig. 37. A little later than above showing a four-nuclei stage of the pro-embryo. May 23, 1904. 
Fig. 38. The same somewhat later showing all the granular substances of the cytoplasm 
accumulated in the lower part of the archegonium. May 23, 1904. 
Fig. 39. A pro-embryo of eight free nuclei and still no trace of cell wall forming between them. 
Fig. 40. An older embryo showing the young suspensors and the embryo proper at the ends 
with the terminal penetrating cap. 
Fig. 41. The same as above but slightly older. 
Fig. 42. The same still older. The cells forming the penetrating cap have been thrown off. 
Fig. 43. An embryo showing the very much elongated and twining suspensors with three 
younger embryos above. 
Fig. 44. A much older embryo. The primary suspensors can no longer be seen, but the 
secondary suspensors developed from the rear cells of the embryo proper are conspicuous. These 
secondary suspensors elongate enormously and carry the embryo at the end deep into the endosperm. 
