PLATE IV. 
Fig. 4. Section of Blastocyst. x200d. 
The cyto-trophoblast appears as a blue-pink lamella with irregular nuclei. Directly 
continuous with it are strands of plasmodium ; only the central strands of the plasmodium 
are represented. The mesoblast is shown as a mass of mucous tissue. The delicate blue 
reticulum which forms its base is largely a precipitation product ; in it are numerous 
small rounded or spindle-shaped cells, which form a very loose syncytial tissue. The 
mesoblast has shrunk away from the cyto-trophoblast on the left, and in the centre is 
the retraction cavity containing a portion of the torn amnio-embryonic vesicle. 
