418 Lawson .— The Garnet op hytes and 
A ventral canal nucleus is formed, but no cell membrane separates it 
from the egg. 
The mature egg nucleus is many times the size of either of the male 
nuclei. 
The union of the sex nuclei occurs in the middle region of the egg, and 
the first segmentation spindle is immediately formed within the membrane 
of the fusion nucleus. 
The first division of the sporophyte is immediately followed by a 
second, forming four free nuclei in the pro-embryo. 
These now sink to the base of the archegonium, and undergo further 
divisions. 
Eventually the pro-embryo consists of three tiers of cells and one tier 
of free nuclei. The middle tier of cells become the suspensors, and the 
embryo proper consist of a large mass of cells, at least sixteen in number. 
Literature cited. 
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Blackman, V. H. (’98) : On the Cytological Features of Fertilization and Related Phenomena in 
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Bot. Gaz., xxxix, p. 161, 1905. 
Ferguson, M. C. (’01): The Development of the Pollen-tube and the Division of the Generative 
Nucleus in certain species of Pinus. Ann. Bot., xv, p. 193. 
(’01) : The Development of the Egg and Fertilization in Pimis Strobus. Ann. 
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Lawson, A. A. (’03): On the Relationship of the Nuclear Membrane to the Protoplast. Bot. Gaz., 
xxxv, no. v, p. 305, 1903. 
—- (’04): The Gametophytes, Archegonia, Fertilization, and Embryo of Sequoia 
sempervirens. Ann. Bot., xviii, no. lxix, p. 1, 1904. 
-- (’04) : The Gametophytes, Fertilization, and Embryo of Ciyptovieria japonica. 
Ann. Bot., xviii, no. lxxi, 1904. 
-(’07) : The Gametophytes, Fertilization, and Embryo of Cephalotaxus drupacea. 
Ann. Bot., xxi, no. lxxxi, 1907. 
- (’07) : The Gametophytes and Embryo of the Cupressineae with special reference 
to Libocedrus decurrens. Ann. Bot., xxi, no. lxxxii, 1907. 
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Miyake, K. (’03) : On the Development of the Sexual Organs and Fertilization of Picea excelsa. 
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