PLATE 1 



EXPLANATION OF FIGURES 



1 Minot embryo, H.E.C. n.^. 825. Reconstruction of vessels in the body- 

 stalk and chorion;connections with the mesothelium. All., aIlantois;6L?.. blood- 

 island ;Coe., coelora; Ect., ectoderm of chorion;/., funnel-shaped connections, with 

 unconnected cords; Mes., mesothelium; Vil.. villus; Ys., yolk-sac cavity. X 175. 



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