Science
In Charles's early childhood, William Cavendish, Earl of Newcastle, was governor of the royal household and Brian Duppa, the Dean of Christ Church, Oxford, was his tutor. Neither man thought that the study of science subjects was appropriate for a future king, and Newcastle even advised against studying any subject too seriously. However, as Charles grew older, the surgeon William Harvey was appointed his tutor. Harvey was famous for his work on human blood circulation, and had already held the position of physician to Charles I. His studies were to influence Charles II's attitude towards science. As the king's chief physician, Harvey accompanied Charles I to the Battle of Edgehill and, although some details are uncertain, he had charge of Prince Charles and the Duke of York in the morning. But the two boys were back with the king for the start of battle. Later in the afternoon, as their father grew concerned for their safety, the princes left the battlefield with Sir W. Howard and his pensioners.
During his exile, in France, Charles continued his education, including physics, chemistry and mathematics. His tutors included the cleric John Earle, well known for his satirical book Microcosmographie, with whom he studied Latin and Greek, and Thomas Hobbes, the philosopher and author of Leviathan, with whom he studied mathematics. In France, Charles assisted his childhood friend, George Villiers, 2nd Duke of Buckingham, with his experiments in chemistry and alchemy, with the Earl convinced he was close to producing the philosopher's stone. Although some of Charles's studies abroad may have helped to pass the time, upon returning to England, he was already knowledgeable in the mathematics of navigation, and was a competent chemist. Such was his knowledge of naval architecture that he was able to participate in technical discussions on the subject with Samuel Pepys, William Petty and John Evelyn.
New discoveries and concepts fascinated Charles, not only in science and medicine, but also in botany and gardening. Sorbier, a French traveller visiting the English court, was astonished by the extent of the king's knowledge. The king freely indulged in his many interests, including astronomy. In October 1660, he visited Gresham College to see new telescopes developed by astronomer Sir Paul Neile. Charles was so impressed by what he saw that he ordered his own 36' telescope, which he had installed in the Privy Garden at Whitehall. He would invite friends and acquaintances to view the heavens through his new telescope. Evelyn describes his May 1661 visit to the Garden, with several other scientists, to view Saturn's rings. Charles also had a laboratory installed in Whitehall, within easy access to his bedroom.
From the beginning of his reign, Charles appointed experts to assist him in his scientific pursuits. These included: Timothy Clarke, a celebrated anatomist, who performed some dissections for the king; Robert Morison as his chief botanist (Charles had his own botanical garden); Edmund Dickinson, a chemist and alchemist tasked with carrying out experiments in the king's laboratory; Sir Thomas Williams, skilled in compounding and inventing medicines, sometimes prepared in the royal presence; and Nicasius le Febure (or Nicolas LeFevre), who was invited to England as royal professor of chemistry and apothecary to the king's household. Evelyn visited his laboratory with the king.
In addition to his many other interests, the king was fascinated by clock mechanisms, and had clocks distributed around Whitehall, including seven in his bedroom. Robert Bruce (later Earl of Ailesbury), a Gentleman of the Bedchamber, complained that the continual noise of chiming clocks disturbed his sleep whenever he needed to stay close by to the king. Charles had a sundial installed in the Privy Garden, by which he could set his personal pocket watch. (For a while, the king personally recorded the performance of the latest spring-balance watch, presented to him by Robert Hooke.)
In 1662, Charles granted a royal charter to the formal society of scientists and others established in 1660 to give a more academic and learned approach to science, and to conduct experiments in physics and mathematics. Sir Robert Moray, a member of Charles's court, played an important part in this, and became the first president of this new Royal Society. Moray was an important go-between for Charles and the Society, over the years, and his standing with the king was so high that he was given access to the royal laboratory to perform his own experiments.
Charles never attended a Society meeting, but remained aware of activities there from his discussions with Society members, especially Moray. In addition, Robert Boyle gave him a private viewing of the Boyle/Hooke air-pump, which was used at many of the Wednesday meetings. Charles however preferred experiments with an immediate practical outcome, and laughed at Society members' efforts to "weigh air". He seemed unable to grasp the significance of basic laws of physics being established at that time, including Boyle's law and Hooke's law, the concept of atmospheric pressure and the barometer, and the importance of air to support life.
Although Charles lost interest in the activities of the society, he continued to support scientific and commercial endeavours, founding the Mathematical School at Christ's Hospital in 1673. Following concerns over French advances in astronomy, he founded the Royal Observatory at Greenwich, two years later. Maintaining his interest in chemistry, he regularly visited his private laboratory, and observed occasional dissections there. Pepys noted in his diary that on the morning of Friday, 15 January 1669, while Pepys walked to Whitehall, the king invited him to his chemistry laboratory. Pepys confessed to finding what he saw there beyond him.
Charles developed painful gout in later life which limited the daily walks that he took regularly when younger. He now channelled his keenness to his laboratory, devoting himself to experiments for hours, sometimes helped by Moray. Charles was particularly interested in alchemy, which he had first encountered many years earlier during his exile with the Duke of Buckingham. Charles resumed experiments with mercury, spending whole mornings attempting to distill it. Heating mercury in an open crucible releases toxic mercury vapour, which may have contributed to his later ill health.