That is fantastic, too many of the old books are overpriced by any standards.

I have been doing a bit of historical research on Stewart and James Baillie, the man he credited with giving him the 'Spider'.

Stewart published his book when he was twenty-four years old and died at thirty-nine.
He was a tea merchant in Edinburgh and died very suddenly.
There is a memoriam to Baillie taken from a book on an earlier Tweed fisher called John Younger.
This memoriam was taken from ?River Angling for Salmon and Trout? by John Younger,
and was added by the editor of the book.

http://www.dtnicolson.dial.pipex.com/page141.html