284 Dr. G. Gore. Relations of Heat to Voltaic and 



in all cases are given in grains per square inch per hour. The 

 following are the orders of the degrees of rapidity of corrosion of the 

 metals at 60 F. 



Table XIX. Simple Corrosion Series at 60 F. 



Remarks. These series and numbers show, 1st, that the order of 

 rapidity of corrosion differed with every different metal and in every 

 different solution ; 2nd, the rates of corrosion of each metal varied in 

 nearly every separate liquid ; 3rd, in each solution also it differed 

 with every different metal ; 4th, the most chemically positive metals 

 were usually the most quickly corroded ; and 5th, the corrosion of 

 metals was usually the fastest in the most acid liquids. These results 

 indicate that the rate of corrosion depends both upon the metal and 

 upon the liquid, probably most upon the former. With* regard to 

 the effect of chemical composition of the liquid, the differences of 

 order between the series with a solution of potassic cyanide and with 



* This sample was found by analysis to contain 89*14 per cent, of actual 

 cyanide. 



