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Changed "tinstone" to "tin-stone" in the footnote on page 110.

These veins are the principal sources of tin in Cornwall, but the same changes may appear in the body of the granite without being restricted to veins, and tinstone occurs also as an original constituent of some granite pegmatites.

Veins of quartz, tourmaline and chlorite may traverse the granite, containing tinstone often in workable quantities.

In the alluvial deposits the associated minerals are chiefly those of great density and hardness, such as platinum, osmiridium and other metals of the platinum group, tinstone, chromic, magnetic and brown iron ores, diamond, ruby and sapphire, zircon, topaz, garnet, &c. which represent the more durable original constituents of the rocks whose distintegration has furnished the detritus.

Stream tin is not pure metallic tin, but is the result of the disintegration of granitic and other rocks which contain veins of tinstone.