The life & career of Ismael Boulliau virtually spanned the century of genius. An accomplished astronomer, mathematician, & classical scholar, Boulliau was an activist in the cause of Scientific Revolution. His voluminous correspondence placed him at the heart of one of the largest intelligence networks of the century. This work is designed as a guide to a correspondence network that helped to unite the learned world of his time. Accordingly, this vol. includes a short sketch of Boulliau’s life & career, followed by an Inventory (& Name Index of the 41 vols. of the Collection Boulliau (BN, FF. 13019—13059). Consisting of over 22,000 pages of manuscript materials. The Collection ranks as one of the largest sources of its kind in the 17th century.