DEVELOPMENT OF THE ALBINO RAT 



33 



Fig. 16 Model of the segment of the oviduct, rat No. 57, 3 days, 17 hours, 

 containing the ova shown in fig. 15. X 50. A portion of the wall of the oviduct 

 and a part of the major folds of the mucosa are removed in the drawing so as to 

 expose the contained ova. The relative position of the seven ova found in the 

 tube is shown, as also the extent and character of the folds of the mucosa. The 

 exact form of each of the several ova could not be reproduced in the model at 

 the magnification used; their position is given correctly. 



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Fig. 17 Camera lucida drawing of a portion of a section of the left oviduct 

 of rat No. 57, 3 days, 17 hours. X 100. This section is of the series of sections 

 from which the models shown in figures 15 and 16 were made. Sections of four 

 8-cell stages, as seen in a single section, are included. The close proximity of 

 three of these ova, their relation to the tubal wall and mucosal folds is to be 

 noted. 



