Depth of, [162];

Connection of, with underground workings, [176];

Data connected with, [177]

Sheet-iron, Thickness and weight of, [189], [190]

Shutes, Explanation of, [43]

Signs, [185]

Silica terraces in the Rotomahana district, [36]

Silver ores, [31], [32]

Silvering copper plates, [149]

Skey, experiments on formation of sulphides, [39], [40];