Studies in the Morphology of Torreya californica. 215 
Fig. 3. “ Epithelial ” cells from a tangential section of the lower part of the 
endosperm. September 16th. (x 400). 
Fig. 4. Diagram of a longitudinal section of an ovule without its arillus, at 
the stage when young archegonia are appearing. August 6th. (x 28). 
Fig. 5. An archegonium with two neck cells from the section shewn in fig. 4. 
(X 400). 
Figs. 6 and 6a. Successive sections of an archegonium ; fig. 6 shewing a neck 
cell nucleus dividing, and fig. 6a shewing an undivided neck cell. 
August 12th. ( x 400). 
Fig. 7. Four-celled neck of an archegonium in transverse section. Sep¬ 
tember 3rd.) (x 400). 
Fig. 8. Six-celled neck of an archegonium in transverse section. August 
25th. (x 400). 
Fig. 9. Six-celled neck of an archegonium in longitudinal section shewing a 
periclinal wall. August 25th. (x 400). 
Fig. 10. Transverse section of a female prothallus with three archegonia cut 
at the level of the nucleus of the central cell. August 20th. ( x 93). 
Fig. 11, Longitudinal section of an archegonium with its surrounding jacket 
cells. August 20th. 3 sections. (x 400). 
Fig. 12. Pollen-tube. July 19th. (x 400). 
Plate VIII. 
Fig. 13. Longitudinal section of upper part of an archegonium shewing 
four neck cells and the oblique spindle of the division of the central 
cell. August 20th. (x 400). 
Fig. 14. Longitudinal section of upper part of an egg cell shewing the egg 
nucleus with its chromatin collected into the centre and above it a 
darkly staining reticulum which may represent the remains of the 
ventral canal nucleus. September 9th. (x 400). 
Fig. 15. End of pollen-tube with body cell behind and stalk and tube nuclei 
together in front. Slight indications of radiate structure in the proto¬ 
plasm of the body cell. September 6th. 2 sections. ( x 400). 
Fig. 16. Body cell with two male nuclei. The nucleus marked marked $ , 
was nearer the neck of an archegonium. September 6th. (x 400). 
Fig. 17. End of pollen-tube in contact with the neck of an archegonium. The 
body cell is elongated so that <? t and <? 2 are much separated. One 
vegetative nucleus is present close to s 2 September 6th. ( x 400). 
Fig. 18. Longitudinal section of archegonium into which the front parts of a 
part of a body-cell with j , has entered, while the rear part of the 
body-cell with <? 2 remains in the pollen-tube «., veg nucleus of p.t. 
or a neck cell, probably the latter. August 31st. 4 sections, (x 400). 
Fig. 19. Longitudinal section of archegonium shewing contact of the male 
nucleus and egg nucleus. August 31st. (x 400). 
Fig. 20. Longitudinal section of archegonium shewing the male nucleus 
becoming engulphed in the egg nucleus. September 3rd. (x 400). 
Fig. 21. Contact of the male nucleus with one side of egg nucleus. September 
3rd. (x 400). 
Plate IX. 
Fig. 22. Longitudinal section of bi-nucleate proembryo. The two nuclei in the 
upper part of the archegonium may be the products of division of the 
second male nucleus. September 12th. 3 sections, (x 400). 
Fig. 23. Longitudinal section shewing second division of fertilised egg. The 
two nuclei remaining in the pollen-tube are probably the products of 
division of the second male nucleus. September 6th. 2 sections, 
(x 400). 
Fig. 24. Longitudinal section of four-nucleate proembryo. The large nucleus 
left in the pollen-tube is probably the second male nucleus, September 
16th. 7 sections, (x 400). 
