The great probability of a North West Passage: deduced from observations on the letter of Admiral de Fonte

"The Great Probability of a North West Passage" by Thomas Jefferys is a historical account written in the late 17th century. This work addresses the historical searches for a North West Passage, primarily focusing on the voyages led by Admiral Bartholomew de Fonte, and examines various accounts and maps related to these explorations. The book also seeks to validate the authenticity of Admiral de Fonte's letters, which were published in the early 18th century, aiming to demonstrate the potential for a maritime route connecting the Atlantic and Southern Oceans. At the start of the book, readers are introduced to the historical context of the quest for a North West Passage and the reputations of explorers involved in it. The opening portions emphasize the significance of de Fonte's expeditions, detailing his journey from Callao in Lima, Peru, and referring to various maps that illustrate the discoveries made. Jefferys articulates a defense of the validity of de Fonte's accounts against contemporary skepticism, laying out reasons for their credibility while also outlining the broader implications of a successful Passage for trade and commerce. The text thus sets the stage for a detailed exploration of maritime discovery and the scientific inquiries tied to such endeavors.