88 



STAGING OF AMPHIBIAN EMBRYOS 



e. Triturus Pyrrhogaster 



STAGES OF TRITURUS PYRRHOGASTER* 



"The development of an egg into a finished embryo is essentially 

 due to factors residing in the egg itself". 



Wilhelm Roiix 



'The elements of our own beliaviour are found in all organisms". 



E. G. Conk I in, 1944 



