collodion plates, 429.
cotton made soluble, 548. 571.
Crookes (Mr.) on restoring old collodion, 206.
Crystal Palace photographs, 571.
cyanide of potassium, 230. 254.
experiences in photography, 429. 456. 501.
ferricyanide of potassium, 549.
glass rod, how to be used, 62.
gun cotton, 283.
history of photographic discovery, 524. 549.