 He studied medical textbooks by Thomas Willis, Thomas Sydenham and Nicholas Culpeper, as well as learning the Dutch language with the implication that he probably intended going to Leiden University for a medical degree.From January 1687 to December 1688 he kept a detailed diary, recording his studies as well as "today I thought upon" entries giving his thoughts on a wide range of subjects ranging from chemistry and theology to horse breeding, building a meeting house, and making a blacksmith's vice.He described the best way to stand when throwing stones, and techniques for archery, billiards, and golf.