443 
Embryo of Cryptomerio Japonic a. 
cells. Numerous cross-walls have already formed, but the cells that extend as far as the vacuole are 
still open on the inner side. The nuclei in these cells still retain their position at the periphery 
of the cytoplasm exposed to the fluid of the vacuole. May 26, 1902. x 150. 
Fig. 19. A longitudinal section of the parietal layer of cytoplasm from the stage shown in 
Fig. 16, but at a much higher magnification. May 26, 1903. x 1500. 
Fig. 20. The same at a little later stage, where the nuclei have just divided. Delicate membranes 
are formed between the daughter-nuclei, and the primary cells or ‘ alveoli ’ are thus organized. 
They are open on the side exposed to the vacuole. May 29, 1903. x 1500. 
Fig. 21. The same at a later stage, showing that cross-walls are formed at this early stage. 
May 26, 1902. x 1500. 
Fig. 22. A section of the parietal layer of cytoplasm taken parallel with the inner exposed 
surface, showing ho^v the walls are formed separating the nuclei. May 29, 1903. x 1500. 
Fig. 23. A longitudinal section of the upper end of the prothallium, showing the multinucleate 
nature of the primary prothallial cells, and also that the walls of these cells are incomplete. May 
26, 1902. x 350. 
Fig. 24. A portion of a longitudinal section of the prothallium, showing the process of free cell- 
formation. May 29, 1903, x 480. 
Fig. 25. One of the free nuclei undergoing division and preparing for free cell-formation. 
May 29, 1903. x 1500. 
Fig. 26. The same at a later stage. May 29, 1903. x 1500. 
Fig. 27. A still later stage of the same, showing the formation of the kinoplasmic fibrils between 
the daughter-nuclei. May 29, 1903. x 1500. 
Fig. 28. The same, showing how the kinoplasmic fibrils curve outward. May 29, 1903. 
x 1500. 
Fig. 29. The same at a little later stage. May 29, 1903. x 1500. 
Fig. 30. The two daughter-nuclei completely enclosed by the kinoplasmic fibrils. May 29, 1903. 
x 1500. 
Fig. 31. A section taken at right angles to the long axis of the spindle of the stage shown in 
Fig. 30. The cross-sections of the kinoplasmic fibrils appear as small dots. By fusing together 
laterally, these fibrils form a membrane. May 29, 1903. x 1500. 
Fig. 32. A section taken same as in Fig. 31. The two nuclei cannot be seen at the same focus. 
May 29, 1903. x 1500. 
Fig. 33- A portion of the prothallium soon after free cell-formation. The membrane formed 
by the lateral fusion of the kinoplasmic fibrils encloses both daughter-nuclei, so at this time the cells 
of the prothallium are binucleate. May 29, 1903. x 480. 
Fig. 34. A longitudinal section of the apex of the young prothallium, showing a group of 
archegonial initials. May 29, 1903. x 350. 
Fig. 35. A longitudinal section of the upper portion of an archegonium, showing the division of 
the neck-cell. The membrane between the two nuclei is not yet formed. June 5, 1903. x 1000. 
Fig. 36. A longitudinal section of an archegonium showing the large egg-nucleus e., and the 
small ventral canal-nucleus v.c. June 1, 1903. x 350. 
Fig. 37. A longitudinal section of a typical mature archegonium ready for fertilization. June 
I 9°3* x 35°- 
Fig. 38. A cross-section through the necks of the archegonia, showing four distinct neck-cells in 
each neck, and also the clefts between these cells. June 2, 1902. x 350. 
Fig* 39. A longitudinal section of the upper portion of the prothallium, showing the typical way 
in which the archegonia are grouped. The jacket-cells surround the entire group, but occasionally 
run up between the archegonia. June 1, 1903. x 170. 
Fig. 40. A cross-section of the prothallium through the region of the nuclei of the archegonia, 
showing the way in which the latter are grouped. There are twelve archegonia shown in the section. 
June 7, 1903. x 170. 
Fig. 41. A section of the central nucleus preparing for the division which gives rise to the ventral 
canal-nucleus. June 2, 1902. x 1000. 
Fig. 42. A group of jacket-cells, showing their multinucleate character. June 9, 1903. x 1000, 
Fig. 43. An archegonium showing the male cell just after it has penetrated. The latter fills the 
entire upper portion of the archegonium and the membrane surrounding it is still intact. June 1, 
*9°3- x 350. 
