108 MISSOURI BOTANICAL GARDEN. 
minute, while the egg is conducted to its destination, and 
then withdrawn by a series of up and down motions. 
In non-technical language, the pistil or the young fruit, 
below the stigmatic tube, shows externally at this time six 
quite distinct longitudinal divisions each having a median 
ridge, there being six corresponding depressions or con- 
cavities in which the six stamens fit, especially at the base. 
Technically, the pistil is a three-celled ovary, the styles bifid 
at tip and united so as to form the stigmatic tube. A 
transverse section anywhere about the middle will show 
that each of the six longitudinal sections contains a row of 
ovules within the ovarian cell. More strictly, the ovules 
are in pairs, as there are but three primary sections or 
carpels, divided by three primary divisions or dissepiments. 
Pl. 36, Fig. 1, shows a transverse section of one of these 
primary divisions or carpels which well indicates the posi- 
tion of the ovule (a) the funiculus (0), the placenta (c), 
and the ovarian cell(d). As the fruit enlarges the three 
secondary dissepiments narrow and coalesce, while the other 
three widen, so that the pod becomes practically three-lobed 
and the seeds are more distinctly in pairs, the inner side 
straight and the external quite convex. In oviposition the 
young fruit is pierced just within the ridge in the depres- 
sion occupied by the stamens, and almost always on the 
side of one of the primary or deeper divisions, where the 
walls are thinnest, so that the ovipositor enters the ovarian 
cell at the external or rounded side of an ovule, and does 
not ordinarily touch the ovule itself. (Pl. 36, Fig. 2, aa). 
Rarely, however, the ovipositor penetrates the ridge and 
passes between two of the ovules, or sometimes even pene- 
trates one, this last case being, however, quite exceptional. 
During the insertion of the egg, which, as stated, usually 
occupies about one minute, a nervous twisting and tremb- 
ling of the body may be observed, and so intent is the moth 
upon this work that after the ovipositor once penetrates the 
pistil, the whole perigon may be detached, some of the 
encumbering stamens and petals removed, and the insect 
