Not much here, but perhaps a little more info:
http://books.google.com/books?id=r1E1FTjEfIkC&pg=PA234&lpg=PA234&dq=Pierre+Soule+Layton&source=bl&ots=Gjb-6DdRjA&sig=_SO-VNBoO2MGUg0pLaZVAO159jg&hl=en&sa=X&ei=Anq3UY6WDKWUiQLMtoDQBQ&ved=0CGAQ6AEwCQ#v=onepage&q=Pierre%20Soule%20Layton&f=false