658 J. T. PATTERSON 
Fig. 27 A section through g to h of figure 29. The buds of Embryos I and II 
are shown in section. The enlargement of the cavity (marked Cav.) lying below 
and to the left of the extraembryonic cavity is an artifact, caused by the lifting up 
of the Triiger epithelium from the mucosa. X 79. 
Fig. 28 Sketch of the blastocyst No. 175, showing the four embryonic rudi- 
ments. x 14.5. 
Fig. 29. Diagram of the same specimen. The broken parallel lines show the 
planes of the sections illustrated in plate 10. X 29. 
