The influence of Blacker's (1842) flies on Soltau (1847)
William Blacker's short 48 page book Blacker's Art of Fly Making was first published in 1842, five years before Soltau.
It is unclear what, if any, influence Blacker had on the flies used by Soltau.
Blacker's book was reissued in 1885. This edition was greatly expanded to 252 pages, and contains hand-coloured lithographs of trout and salmon flies that are greatly prized by book collectors: "Without a doubt, Blacker was a much better fly dresser than author, yet his book is still a major milestone in angling literature. The plates are outstanding (a major reason why the book is prized by collectors) and much of the information in the book is difficult to find elsewhere." (Jackson 1982).
But hand-colouring introduces variation between copies in the representation of the colour of the artificial fly . The 1885 edition need not be discussed in detail here because its publication date means it could not have influenced Soltau.
Blacker (1842) gives the components (patterns / dressings for) 31 named trout flies, and the months when they should be used.
Soltau (1847) gives illustrations of 18 unnamed flies with brief notes on where and when they should be used. Soltau gave this as his reason for not naming each fly : "Each fly is entitled to a distinct appellation, but it frequently happens that the dun of Mr. A. differs materially from that of Mr. B.; thus the sportsman is disappointed in his application—when the packet arrives he scarcely recognises one of his old acquaintances." To overcome this problem he gave a list of reliable suppliers. (Soltau 1847 p 41).