150 THE ACTION OF SEA-WATER UPON CAST-IRON. 
screw he I understand, only superficially acted upon; the 
examined by me came from one of the blades. On analysis it was 
found to have the oneloneg a 
Carbon we as SOE 
Tron protoxide jes ves tee) oe 
Tron sesquioxide_... ~ ig 1:79 
Iron, metallic... oe os an “04 
Siiiedelces ara ves may ote 62 
Phosphorus ... -_ dae ... absent 
Sulphur oe “ oes “a 
Silicon a see — ne 5-59 
the mixed carbonates of potash and soda, the carbon being burnt 
off by the addition of potassium chlorate ; ‘the residue was ext 
with boiling water, the silica rendered insoluble and d in 
the usual way. — 
It is interesting to note that the phosphorus has been ¢ 
apr ; P 3 d that the jar 
ly present in the 
original cas re 
Several balsas of the effects produced by sea-wat 
Gme coe. his “ Handbook 
Some cannon-balls lying in the sea on the coast of i | 
1692, had retained their form and ve but = _ ee »t, and 
weight, srry to the knife, did no naa Ce fod, 15 
metallic iron Dalene J., Chem. Mey 
