452 MOUSE EMBRYO 



be qualitative, requiring histological and even cytological techniques. It should be re- 

 membered than even with highly penetrating and uniform x-ir radiation, there are varia- 

 tions in response within a litter (which contains genetically different individuals) so that 

 spot testing of litter members may not be scientifically adequate. Congenital anomalies 

 of gross dimensions may be seen at 1 8. 5 days gestation by sacrificing the pregnant 

 mouse and dissecting out the fetuses. Anomalous mice are usually destroyed at birth 

 by the mother. 



The mammalian embryo is almost an unexplored field for experimentation. This exer- 

 cise is added to stimulate interest and investigation in a field which the author is certain 

 will become very active in the innmediate future. 



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