Fig. 72. — Showing effects of 

 rays of radium upon plants. 

 (From Gager.) The plants in 

 this case are Ouagra biennis, 

 showing arrested development. 

 The ovary was exposed to 

 radiations of radium bromide 

 ( 10,000 X) in a sealed glass 

 tube for 53 hours. 



