printing positives, 406.
Rembrandt, photographic copies of, 359.
sensitive collodion, 158.
silver, its recovery, 476.
slides for the magic lantern, 332.
splitting paper for photographic purposes, 61.
spots on collodion pictures, 310.
stereoscopic note, 282.
tent for collodion purposes, 83.
Talbot's patents, 83. 526. 599.