Corrosion (grams of 
16. 6 
Heise and Clemente: Corrosion of Iro7i 
445 
Potassium dichroraate concentration grams of K2 Cra 0^ in 400 cc. H3 SO.i. 
Pio. 1. The effect of potassium dichromate on corrosion of iron in sulphuric 
acid. Line a, 0.5 N sulphuric acid, 20 hours ; line 6, N sulphuric acid, 21 hours : 
line c, 2 N sulphuric acid, 22 houfs. 
