1915] BURLINGAME—ARAUCARIA BRASILIENSIS 37 
very much smaller than the diameter of a male cell; the figure also shows how 
the egg cytoplasm has been crowded out through the neck by the entrance of 
the male cells; 250. 
Fic. 11.—Fertilization: the male nucleus is above; both nuclei are 
enveloped already in the male cytoplasm, which is distinguished from the egg 
cytoplasm around it by being much denser; this figure shows the only case 
observed in which the male nucleus is larger than the female; X 250. 
Fics. 12 and 13.—Two consecutive sections through a male and female 
nucleus in the act of fusing; the male nucleus is to the left of the figure; the 
nuclear membrane has broken down in the middle region of contact (fig. 13), 
but not throughout (fig. 12); each nucleus is enveloped in a distinct sheath of 
cytoplasm, probably derived from the kinoplasmic layer sometimes surround- 
ing the egg nucleus, as well as from the male cytoplasm; X 250. 
Fic. 14.—A median section through two nuclei in which the nuclear mem- 
brane had not yet broken down, showing how the male nucleus flattens out 
and applies itself to the curved surface of the egg nucleus; X 250. 
Fic. 15.—Fusion of two nuclei showing the fine-grained nuclear contents 
and the weakening of the nuclear membranes; two blepharoplast-like bodies 
are also shown; the left-hand one may be, possibly, a vegetative nucleus in an 
advanced stage of degeneration; X 250. 
1G. 16.—The second male cell in an archegonium: the male cell is cut 
in the median plane, but only one of the two nuclei of the proembryo below is 
shown; the dark portion in the center is the nucleus crowded full of large 
masses of chromatin-like material; around it is seen the zone of male cytoplasm 
appearing lighter than the surrounding egg cytoplasm or the inclosed nucleus; 
this cell has probably become considerably changed through degeneration; 
250 
Fic. 17.—Another section through the same archegonium as the preceding, 
showing one of the blepharoplast-like bodies in the edge of the male cytoplasm 
and a nearly median section of the 2-celled proembryo; X 250. 
Fic. 18.—Median section of a 2-celled proembryo; X 250. 
Fic. 19.—Another 2-celled proembryo; 250; figs. 17-19 show that the 
first division may occur in any plane, horizontal, vertical, or oblique. 
Fic. 20.—Median section of a 4-nucleate proembryo; X 250. 
Fic. 21.—A 6-nucleate proembryo; X 250. 
Fic. 22.—A s-nucleate proembryo; X 250. 
Fic. 23.—A 4-nucleate proembryo with all the nuclei in nearly the same 
vertical plane and at the bottom of the cytoplasm; 250. 
Fic. 24.—A 9-nucleate proembryo; X 250. 
Eics, 2 5-29.—Proembryos with 15-40 nuclei variously arranged, but 
none with exactly 16 or 32; 250. 
Fic. 30.—A 45-nucleate proembryo, with the nuclei properly arranged 
for wall formation; the cap nuclei are already beginning to elongate; 250. 
