PLATE XII 



YOLK OF HEN'S EGG AT THE SECOND DAY OF INCUBATION 



Microphotographed by Dr V. Marza through crossed Nicol prisms (31°). 

 The doubly-refracting esters of cholesterol are seen to be localised at the 

 periphery of the vitelline globules. Magnification 8 x A. 



