444 Lawson. — The Gametophytes of Cryptomeria J aponica. 
Fig. 44. An archegonium showing the fusion of the male and female nuclei. The nuclear 
membrane between the two persists for some time. June 5, 1903. x 350. 
Fig. 45. A later stage of the same, showing that the female nucleus almost completely envelops 
the male before the membrane between them breaks down. The structure of the chromatin of the 
two nuclei are very similar at this time. June 1, 1903. x 1000. 
Fig. 46. The first segmentation-spindle surrounded by a dense zone of starch-granules. June 9, 
1903. x 2000. 
F'ig. 47. A spindle of the second division of the pro-embryo, showing the large number of long 
V-shaped chromosomes on their way to the poles. June 9, 1903. x 2000. 
Fig. 48. A spindle of the division of one of the free nuclei of the endosperm, showing that there 
is clearly half the number of chromosomes in the gametophyte that there is in the sporophyte as 
shown in Fig. 47. May 29, 1903. x 2000. 
Fig. 49. An archegonium showing the fusion-nucleus surrounded by a zone of starch-granules. 
June 9, 1903. x 35 °- 
Fig. 50. An archegonium showing two free nuclei ; the result of the first division of the fusion- 
nucleus. June 9, 1903. x 350. 
Fig. 51. An archegonium showing the result of the second division after fertilization. The 
pro-embryo now consists of four free nuclei. June 9, 1903. x 350. 
Fig. 52. An archegonium showing six free nuclei in the pro-embryo. June 9, 1903. x 350. 
Fig. 53. An archegonium showing four nuclei of the pro-embryo. Two of the nuclei have 
settled at the base of the archegonium. The zone of starch is carried to the base with the nuclei. 
June 9, 1903. x 350. 
Fig. 54. The base of an archegonium showing four free nuclei lying in a sharply differentiated 
starch area. Kinoplasmic fibrils radiate out from the nuclei preparatory to forming the membranes 
between the latter. June 9, 1903. x 350. 
Fig. 55. A later stage than Fig. 54, showing that the first membranes between the free nuclei 
of the pro-embryo are formed parallel to the long axis of the archegonium. June 9, 1903. x 350. 
Fig. 56. A later stage of the same, showing that the second series of membranes is formed at 
right angles to the long axis of the archegonium. June 9, 1903. x 350. 
Fig. 57. A later stage of the same, showing that the embryo now consists of two tiers of well- 
defined cells and one tier of free nuclei. June 29, 1903. x 350. 
Fig. 58. A later stage, showing that the middle tier of cells has developed into a series of long 
suspensors, which carry the lower tier, or embryo proper, down through the endosperm. June 7, 
I 9 ° 3 * x 35 °- 
Fig. 59. A later stage, showing the long tortuous suspensors with the embryo at the tip. June 
25, 1902. x 170. 
