A Practical Manual, by Samuel Dwight Humphrey                            63517   [Full title: A Practical Manual of the Collodion Process, Giving in                 Detail a Method For Producing Positive and Negative Pictures                 on Glass and Paper.]   [Link: http://www.gutenberg.org/6/3/5/1/63517 ]   [Files: 63517-8.txt; 63517-h.htm] Thanks to Tom Cosmas produced from files generously provided on The Internet Archive. All resultant materials are placed in the Public Domain. Chuck