270 G. CARL HUBER 
grouped between two opposing folds of the mucosa. Their 
general relations are shown in figure 10, a reconstruction under 
higher magnification of the segment of the oviduct containing 
Fig. 9 Model of the left oviduct of rat No. 62, 2 days, 22 hours. X10. Not 
quite the entire oviduct was available for reconstruction, thus the relative posi- 
tion of the upper end of the uterine horn is not shown in this figure. Fimbriated 
end and infundibulum removed in the drawing, so as to expose the underlying 
loops; their relative position is given in dotted outline. The position of five 2- 
cell stages, found within this tube, is given as if seen through a transparent wall. 
Fig. 10 Model of the segment of the left oviduct of rat No. 62, 2 days, 22 hours, 
containing the five 2-cell stages, the general position of which is shown in figure 
9. 50. Note the compact grouping of the ova. 
the ova, cut so as to expose the lumen. At the magnification 
used it was not possible to reproduce in the model the exact 
shape of the several ova, their relative position is, however, 
correctly given. In all, ten oviducts, containing 40 ova in the 
2-cell stage, are included in my series. Of these, two, as above 
given, were reconstructed by the Born method. The other 
eight were reconstructed graphically, beginning with the uterine 
