ATLAS 867 



PLATE XIII 



Two EARLY STAGES OF CLEAVAGE OF THE EGG 

 (Wilson) 



PLATE XIV 



Two LATER STAGES OF CLEAVAGE OF THE EGG 

 (Wilson) 



PLATE XV 



BY THREE-COLOR PHOTOGRAPHIC PROCESS 



FIG. i FIG. 4 



Section of the ovary Section of the chick 



FIG. 2 FIG. 5 



Testicle Section of the chick 



FIG. 3 FIG. 6 



Section of the chick Section of the chick 



PLATE XVI 

 BY THREE-COLOR PHOTOGRAPHIC PROCESS 



FIG. i 

 High section through thorax of human embryo 



FIG. 2 

 Low section through thorax of human embryo 



FIG. 3 

 High section through abdomen of human embryo 



FIG. 4 

 Low section through abdomen of human embryo 



FIG. 5 

 Sagittal section of a pig-embryo 



FIG. 6 

 Sagittal section of a pig-embryo 



