by Louis Rhead  1916 
 it’s hard to tell how much humor was originally intended by the author but here’s an amusing 177 page blast from the past with all sorts of goodies such as:
Trout flies in April- When insects first appear
Why it is best to copy nature
Shiny Devils and
Artificial frogs that wiggle their legs and float

once past the silly giggles we’ll notice that Rhead was quite the modern and even avant-garde angler, completely understanding the successful fly fisher will not solely fish with surface flies but also larval and nymphal imitations and that typical ‘trout-insects’ aren’t the only food item our slimy friends like to eat.
he also didn’t have any qualms criticizing his peers when need be and thought that sticking needles into insects wasn’t the best way to study a living creature.

a really nice informative and entertaining read, click either image to access the complete e-book on internetarchive.org.
enjoy !