Dedicated to "Sophronia" (i.e., Robert Boyle's "dearest sister," Lady Ranelagh), the author is seen here in his happiest mood. Written while he was on a holiday at his manor house in Stalbridge, Dorset, Boyle draws in this work a parallel between natural phenomena (e.g., the slaking of quicklime) and his spiritual philosophy. Some sections deal with angling, and the book at one time was wrongly attributed to Isaac Walton. The entertaining text displays Boyle's wide-ranging interests and embraces such topics as glowworms, meteorology, horses, apples, syrups, the singing of larks, candles and lanterns, and astronomy.
The title page of this work and dedication are digitized here.
Boyle, Robert. Occasional Reflections upon Several Subjects. Whereto Is Premis'd a Discourse about Such Kind of Thoughts. London, England: W. Wilson for Henry Herringman, 1665. https://digital.sciencehistory.org/works/k643b2085.