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