26 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. X 10. 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. X 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 



