DATAG) G. CARL HUBER 
in figure 15, two views of each model being shown. Five of 
the models, A to EK, show 8-cell stages. In F, there is figured 
an 1l-cell stage, three of the cells having completed the next 
following division. As may be seen from the figures, the form 
of these morula masses is not spherical but in the main slightly 
oval, with further irregularities better shown in the models than 
in the illustrations, due to the fact that the egg masses con- 
form to the shape of the lumen of the oviduct in the region in 
which they are found. The mucosa lining the segment of this 
Fig. 15 Models, obtained by reconstruction after the Born method, of 8- 
cell and 11-cell stages of the albino rat. Rat No. 57, 3 days, 17 hours. X 200. 
Two views of each model is presented. A-A’, to E, E’ are of models of 8-cell 
stages; F and F’ of a model of a 11-cell stage. 
oviduct containing the ova presents four quite regular longitudi- 
nal folds. In figure 16, there is presented a model of a detailed 
reconstruction of the segment of the oviduct containing the ova, 
their relative position in the tube and their relation to the major 
folds is clearly shown. One of these folds it was necessary to 
in part remove so as to bring to view in the drawing certain of 
the ova. In figure 17, there is reproduced a portion of one of 
the sections of the series from which the medel shown in figure 
16 was made. The fold of the mucosa occupying the center 
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