—— soiling of the fingers, 162.
—— Society, 120.
—— Society of Arts, their exhibition, 22.
—— solutions, 48. 265. 363.
—— stereoscopic pictures, 48. 70. 505. 557.
—— sulphuric acid, 265.
—— talc for collodion pictures, 338.
—— Taylor's iodizing process, 187. 217, 218. 244. 364.
—— tent, 462. 485. 534.
—— wax-paper process, 71. 93. 218.