A Discourse Presented to the Most Serene Don Cosimo II., Great Duke of Tuscany, Concerning the Natation of Bodies Vpon, and Submersion In, the Water.

In this compact treatise, a celebrated philosopher‑mathematician turns his keen observational eye to the mysteries of water, offering a systematic look at how bodies move, float and submerge. Drawing on experiments and careful reasoning, he lays out a series of propositions that reveal the forces at play beneath the surface, inviting the reader to reconsider everyday phenomena through the lens of early modern science.

Interwoven with the discussion of water are vivid passages about recent celestial discoveries—new insights into the motions of planets and sunspots that have stirred the scholarly world. The author explains how these astronomical findings inform his approach to measuring motion, linking the heavens and the depths in a single, unified inquiry. Listeners will be drawn into the lively blend of practical experimentation, bold speculation, and the spirited voice of a thinker eager to share his latest breakthroughs with a patron of the arts.