ANATOMY AND PHYSIOLOGY. Lia 
and, if we can procure one, a dissecting microscope. 
We begin by removing the stomach with great care, 
dividing it where it dips down between the ovaries. 
The central air-trunk should then be cut through, as 
near the pedicle as possible, and gently drawn on, 
clearing away the trachee the while, till the egg 
tubes come into view. The whole mass may now be 
withdrawn, with a portion of the colon, in connection 
with the two last dorsal scales. We should procure 
as many of these ends of wasps as we can, and set 
them aside in glycerine. For the dissection is long, 
and we shall probably need a good many specimens 
before we succeed in fairly displaying all the parts. 
Now, placing one of these fragments in a watch- 
glass full of water, steadied on an India-rubber ring, 
if we carefully remove the dorsal scales, and the 
sting with its bulb, we shall readily distinguish the 
two bundles of egg tubes. These converge at one 
end to an air trunk, at the other to a smgle mem- 
branous canal; from which point we may most 
conveniently begin their description. This canal is 
called the uterus or oviduct, the latter name perhaps 
being the most correct, as it resembles in its functions 
the oviduct of birds rather than the uterus of Mam- 
malia. Tracing this backwards from the point 
where it emerges from the muscular bulb of the sting, 
the first object which attracts notice is a little oval 
vesicle, distinguishable at once from the round, hard 
poison bag by its much smaller size and greater 
softness. It stands at right angles to a short tube, 
by which it communicates with the upper side of the 
oviduct. From its other end arise two small tubular 
glands. This is the spermatotheca, designed, as its 
