Here is an example from page 157:
I think Hayter must be correct in saying that some fly fishing techniques are re-invented several times."...in a 1935 number of the Journal of the Flyfishers' Club, Mottram extended the scope of this tactic into something resembling the Leisenring Lift, a technique, as with many others in angling, which may have been re-invented several times. He wrote:"
The leaded nymph is often far more attractive than the unleaded, because with it you can imitate the rising of a nymph from the bottom. To do this, oil the gut and line to within two feet of the fly, cast well above and a little beyond the trout, allowing the whole to drift down to the fish without drag. As it passes the fish, gently draw on the line, causing the nymph to ascend through the water in imitation of a natural, and if all goes well the trout will follow it up and take it.
Leisenring, in the manuscript that is at Yale, didn't call it a "Lift", but rather a "Deadly Curve," that swam upward with drag across the current in a tantalizing arc in front of the trout. In England, there was heated opinion, pro and con, regarding the drag involved in "curving" the rising nymph. The dead drift, sacred to the dry fly, was also gospel for some wet fly folks. Hayter does a beautiful job of taking us back to those days, and sketching the personalities involved.
Mottram issued two books: Fly Fishing: Some New Arts & Mysteries, 1915 and Thoughts on Angling, 1948. I get the impression from Hayter that Mottram has been under-recognized for his early experiments in tying flies to match pupae, larvae, and nymphs, including midge pupae. Skues, a loner, considered Mottram a rival, so they never put their heads together to share knowledge they way Halford and Marryat had done.