The Early Dcvclopinoiit of the Pigeon's Egg. 7 



cytoplasm in the mass of yolk granules except by the presence of 

 nuclei and except in a few places where cytoplasmic islands and 

 strands appear. The periblastic zone, as shown by a dotted circle 

 in the charts, appears in the surface view of the living eggs at certain 



)\ 



V 

 Y 



^ 



T 



X^ 



^=^ 



^ 



C ---^-t. 



Chart I. 



C t 



"o~~r 6 



Chart II. 



stages and is shown in several photographs. Fig. B is a diagram 

 reconstructed from a st-iidy of transverse sections, and Fig. C is 

 a diagram of a central transverse section. The sperm nuclei and 

 the periblast nuclei represented in Fig. B of the several charts are 



