Silurian system, [19]

Silver, [80], [102], [335]

Sind, [394]

Sirmium, [227]

Skins, use of; for clothing, [56] for writing, [75]; inflated as boats, [91]

Skull, Rhodesian, [52]

Slavery (and slaves), [94], [102 ], [188], [191], [194], [203] et seq., [236], [320], [337], [373], [374], [384-86], [388], [430], [433]

Slavonic language, [236]

Slavs, [263], [265]

Smelting, [87], [104], [322]