Indeed, I got my copy from Walton Powell (authors' son) himself when the Powell company was still alive. His grand son Press Powell published the "Essays on fly fishing" in 1989, it gathers texts from 1910, 1919 and 1937, including the following document which I bought from an English book specialist many years ago. Now I think it is time to press the Pause button Michael, since our discussion is going nowhere. I shall wait and see if your theory substanciate in the future.I m told it in essays from é.c. Powell 1919 (3 essays on flyfishing) book is not available anywhere.
Merlin