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



Table XX. Simple Corrosion Series at 160 F. 



and this was a very feeble one. The increases of rate of corrosion 

 under the influence of heat were extremely variable, whilst that of 

 tin in dilute nitric acid was increased 1'5 times, that of copper in 

 hydrochloric acid was increased 321'6 times ; both these metals and 

 acids were very pure, and not a trace of oxide appeared upon the 

 tin. The total average increase for the entire series was 29'98. The 

 changes produced in the orders of the series by difference of tempera- 

 ture were least in dilate hydrochloric acid. The results contained 

 in Tables XIX and XX show that when metals are rendered 

 thermo-electro-negative in liquids by being heated, their electric 

 change is not attended by diminished rapidity of corrosion. It 

 was found by comparing Table XIX with Table I that the propor- 

 tion of cases in which the metal most corroded was more thermo- 



* This was the only case of decrease, and was yerified by means of a repetition 

 experiment. 



