ANATOMY AND PHYSIOLOGY. 177 
much more easily procured than queen-bees, and 
what we cannot display in one specimen we may 
find in another, with leisure and patience. 
Glands, tubes, and membranes, in their elementary 
forms, are of such universal occurrence, and are 
structures of such plasticity of development, that 
organs composed of these materials admit of great 
variety of form, and occur—are improvised—almost 
anywhere. Such are the simple appendages to the 
oviduct which we have just been tracing. They are 
mere appendages to what is itself merely the duct of 
another organ. The materials of which they are 
made are not peculiar to the parts, for they are found 
everywhere; it is their plasticity that is peculiar, 
their power of adaptation to all the minutiz of local 
requirements. This very power tells us not to ex- 
pect to find identity of form here in the two sexes 
respectively; and least of all in parts where the 
correspondence is essentially one not of siepenes 
but of reciprocity. 
In the ovaries however we see, at once, that we 
| are dealing with a more important 
structure, and the analogy to the 
testes of the male is complete, both 
in internal structure and in external 
conformation and relations. Just,.in 
fact, as in the higher animals. As we 
follow the uterus, or, in accordance 
with these views of its functions, the 
oviduct backwards, we observe that 
it divides into two horns. These are 
again each subdivided into six egg- 
Fig. 10.—Uterus, 
ovaries, and spermatotheca of a pregnant female. 
N 
