234 



BIRGE 



100 



80 



<60|— 

 > 



> 



cr 



5? 40 — 



20 



 , Goldfish 

 • , Trout 

 A , Toad 



0.001 



0.01 0.1 1 



GERMANIUM CONCENTRATION, ppm 



Fig. 4 Effects of germanium on embryo— larval stages. 



100 



100 



> 



ca 



C/3 



0.001 



0.01 



0.1 1 



LEAD CONCENTRATION, ppm 



100 



Fig. 5 Effects of lead on embryo— larval stages. 



