5:^ 



Aluminum . Aluminum nitrate was used at certain con- 

 centrations, bd>th alone and in combination with magnesium 

 and calcium nitrates. Series were aarried out, and several 

 times repeated, including the combinations and concentrations 

 which are tabulated below. 



Table II. 



Concentration of A1(NC3)3 



molecular 



Concentration of i:g(NC3J2 

 or of Ca(N03>2» 

 molecular 



