I.!g (1^03)2 markedly decrease the toxicity of ^n(NC3)2, but 

 neither exhibited any effect on j:he toxicity of A1(NC3)3 

 at the concentrations used in these experiments. 



The effects produced by the various single salts 

 upon the germinating fungus spores are of interest in that 

 four types of response to the toxic stimulus are clearly 

 discernible. It was usually possible to bring about these 

 four types of response in any one of the compounds used in 

 this study by varying its concentration. If the substancrs 

 are arranged in the order of their toxicity as evidenced by 

 their inhibition of spore germination, this same arrange- 

 ment is found also to li Id for their effectiveness in bring- 

 ing about the less final changes which lead to abnormal 

 growth. 



