CHEMICAL EFFECT ON GROWTH & DIFFERENTIATION 165 



There is a current interest in mitotic Inhltitora such as colchicine and the nitrogen 

 mustards, which indirectly affect development. It is expected that within the next few 

 years the chemical separation of ontogenetic processes will he extended to great lengths 

 by the use of such and related chemical suhstances- on the amphihian emhryo. 



BEFESMCES : 



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'Tr easure your except ions .'" - Bateson 



