126 



AGEING OF THE EGG AND DEVELOPMENT 



POLAR BODY PIT 



MARGIN OF 

 DEPIGMENTED CORTEX 



DEPIGMENTATION OF ANIMAL HEMISPHERE OF AGED EGG 



(see also page 77) 



Second polar body elimination 20 minutes after insemi- 

 nation of frog's (R. piplens) egg at 23 - 25 C. 



"Living things are analyzed into organs, tissues, cells, chrom- 

 osomes, genes, and their functions inlo tropisms, reflexes, and forced 

 movements, while the synthesis of all of these elements into the broader 

 aspects of the organism and its relation to environment are too much 

 neglected. " 



E. G. Conklin 1944 



