262 G. CARL HUBER 
nection with the uterine horns, with folds and epithelium much 
as in the third segment, and a prominent musculature. In all 
essentials, this description applies to the oviduct of the albino 
rat, except that in the first segment the accessory nuclei de- 
scribed by Sobotta as found between the epithelial cells were not 
evident in the rat. In figure 3, is reproduced a model of a wax 
reconstruction of the right oviduct of rat No. 106, killed 24 
hours after the beginning of insemination, and containing eight 
ova in the pronuclear stage. This oviduct measured from 
fimbria to termination in the uterine horn 3.2 em. It pre- 
sents 10 major folds, which folds may be recognized with more 
Fig. 3 Model of right oviduct of rat No. 106, 24 hours.  X 10. Fimbriated 
end and infundibulum removed in the drawing so as to expose underlying loops; 
their relative position given in dotted outline. The position of the ova, which 
are outlined in circles, is shown as if seen through a transparent wall. The rela- 
tive position of three of the eight ova found within this tube cannot be revealed 
in this view of the model. 
or less clearness in all the models made and here reproduced. 
The slight difference in the relative position of these folds as seen 
in the several figures may be accounted for by the varying de- 
grees of tension to which the tissues were subjected prior to 
fixation. In rat No. 106, the ovaries with oviduct and upper 
end of the uterine horn, were excised and placed in the fixing 
fluid without applying any tension. Of these 10 major folds, 
the four distal ones, those beginning with the fimbriated end, 
fall to segments one and two of Sobotta’s designation, having a 
wide lumen and folded mucosa. In the figure, the position of 
the ova is indicated by small black circles. By reason of the 
relation of the folds, only five of the eight ova can be brought 
