"Trout Flies of Devon and Cornwall, and When and How to Use Them" by G. W. Soltau is a comprehensive guide to fly-fishing, written in the mid-19th century. This book presents a meticulous examination of the trout fishing practices specific to the rivers of Devon and Cornwall, advising on the types of flies that yield the best results in various conditions. Soltau leverages his extensive experience to share insights that cater to both novice and seasoned anglers, emphasizing the importance of local knowledge in achieving success in fishing. In this treatise, Soltau highlights the art of fly-fishing, detailing the intricacies of choosing the right flies, the proper techniques for casting, and the optimal times for fishing. The book is not merely a catalog of flies but is enriched with anecdotal wisdom that draws from the author's long-term engagement with the craft. Divided into sections that cover specific fly patterns and their seasonal effectiveness, as well as practical tips on fishing strategies, it serves as both a practical manual and an enjoyable read, fostering a deeper appreciation for the natural world associated with fishing. (This is an automatically generated summary.)