368 Miyake. — On the Development of the Sexual 
to the base of the archegonium. No wall is formed between 
these four nuclei, as supposed to be the case by some previous 
investigators. 
1 6. The four free nuclei at the base of the archegonium 
divide simultaneously. After eight nuclei are completely 
formed, the walls are laid down between them, as in the case 
of Pinus described by Miss Ferguson. 
17. The upper four nuclei now divide, instead of the lower 
four as described by previous investigators, and then follows 
the division in the four cells of the lowest tier. The pro- 
embryo thus formed consists of three complete tiers of four 
cells each, and the tier of four nuclei which are separated 
from one another by walls but freely exposed above towards 
the main mass of the egg-cytoplasm. 
18. Among several abnormal archegonia observed, the 
archegonium without neck-cells was often noticed. In one 
of them the ventral canal-cell was seen at the side instead 
of at the top of the egg. Double archegonia, one arche- 
gonium lying above the other, were observed several times. 
The lower one, which is usually somewhat larger than the 
upper one, has no neck-cells, while the formation of the 
ventral canal-cell usually takes place in both of them. 
Botanical Department, Cornell University, 
Ithaca, New York, U.S.A. 
