"The Inca Emerald" by Samuel Scoville, Jr. is a novel written in the early 20th century. The story centers around Big Jim Donegan, a wealthy lumber magnate, and Professor Amandus Ditson, a scientist from the Smithsonian Museum, as they embark on an adventurous expedition in search of legendary emeralds associated with the lost city of Eldorado. This quest intertwines the dangers of the South American wilderness with the allure of ancient treasures, creating an exciting narrative filled with peril and discovery. The opening of the book introduces us to Big Jim Donegan, who is comfortably settled at his estate when he unexpectedly meets Professor Ditson. Their conversation reveals Jim's passion for gem collecting and Ditson’s knowledge of a manuscript that points to a sacred lake in Peru where emeralds were once thrown as offerings. Intrigued by the prospect of adventure and treasure, Donegan agrees to fund the expedition, enlisting the help of seasoned locals Jud Adams, Will Bright, and Joe Couteau, who have their own shared history of thrilling escapades. As the group prepares for the expedition, the tone of danger is established with hints of ominous superstitions regarding the journey ahead, setting the stage for a tale of adventure filled with perilous encounters along the Amazon River. (This is an automatically generated summary.)