716 



Teratogenesis 



togenic agency, the length of time it is ex- 

 posed, the pliysiological condition of the 

 embryo and its resistance or susceptibility 

 as determined by its genetic constitution. 

 Similar anomalies may result from more 

 than one developmental aberration. 



Teratology is still at the stage where it 

 is most concerned with the visible effects 

 which are the expression of prior physio- 

 logical disturbances. The next big step in 

 studies of the etiology of anomalous develop- 

 ment must concern itself with the details 

 of these physiological processes. 



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