18 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 cm. 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 



