1214 Development of a Dandelion Flower, (December, 
as the forming stamens (Fig. 4 4). These stamens remain per 
fectly distinct until quite late in the history of the 
---a bud, when they have become very much elon- 
gated. Then the edges of the anthers, coming 
in contact, begin to cling; the union appears to 
_..¢ become firmer and firmer, until it takes quitea 
pull to separate them. The union, however, is 
only apparent, for careful cross-sections show 
close contact between incurved edges, incurved 
as if by being pressed firmly together, but no 
blending of tissues. The two contiguous epider- 
mal layers are continuous and complete. (Fig.5) 
To complete the account of the development of the stamens, 
mention should be made of the pollen grains. As soon as the 
anther cells begin to elongate, exchanging ther 
et Gly broadly oval outline for one that is narrower and 
Fic. 5. finally linear, it is easy to detect within them ae 
ably well-defined rows of large, squarish mother-cells, about two 
rows in each half of the anther. As the growth proceeds the 
contents of these mother-cells are seen to pass through the wel- z 
known stages in the development of four pollen grains in eac 
The pollen grains, when first freed from the mother-cell, * 
roundish, but when the hairs begin to appear upon the style, they 
become quite angular, generally six-angled in outline. A close 
inspection shows that this angular appearance is due to the begit- 
ning development of the wings, which gradually Jen aft 
broaden and become dentate, until the mature pollen grains Vey 
closely resemble those of Cichorium, so commonly fig way 
The third organ to make its appearance is the pistil. cy 
the stamens have become oval masses and are just be pee 
constrict below into short, broad filaments, just within the $ : 
mineal circle, there arise, at the so-called node, two OMe ae 
upon opposite sides. Below the node, within, there 1$ y% E 
a cavity, and the two outgrowths rapidly develop towards 1 
other, overarching the cavity below, and presently meet 
center, when they resemble two lips (Fig. 4 ¢). These 4P > 
together, forming the style, and then elongate, Soon == 
little longer than the stamens. In the meantime the cavity © 
is being constricted from above downward, until the py e 
cavity has become flask-shaped, and the neck of the ei 
up, leaving the cavity of the ovary some distance below aii 
