The Sherborne Notebook and the Nature of Spirit
How Cycling Sixty Miles to School and Losing Christopher Morcom Shaped a Materialist Mind
Railroad workers, coal miners, and dockers walked off their jobs across Britain in May 1926 as the Trades Union Congress called a nationwide General Strike. When the cross-Channel ferry from Saint-Malo docked at Southampton on May 3, Alan Mathison Turing found every passenger train to Dorset canceled. Rather than wait at the port for rail service to resume, the boy retrieved his bicycle from the baggage hold and bought a road map. Over the next two days he pedaled sixty miles across Hampshire and Dorset. He stopped overnight at an inn in Blandford Forum and rode through the gates of Sherborne School the next day.
Sherborne was an old West Country boarding school whose curriculum centered on Latin, Greek prose composition, and athletic drills. Its headmaster, Nowell Smith, sent stern reports to Turing's parents, Julius Mathison Turing, a retired administrator from the Indian Civil Service, and Ethel Sara Stoney Turing. Smith warned them that a boy who preferred solitary chemical experiments to classical verse had no place in an English public school. Unmoved by the reprimands, Turing brewed iodate-sulfite clock reactions in a makeshift laboratory and ground parabolic mirrors. In 1928 he filled a pocket notebook with tensor derivations abstracted from Albert Einstein's general theory of relativity.
That intellectual isolation ended in 1927 when Turing met Christopher Collan Morcom, a slender student one year ahead of him at Sherborne. Coming from a family of engineers and scientists, Morcom combined rapid mathematical intuition with disciplined experimental habits. Together the two boys verified the Law of Mass Action in the school science rooms. They also computed perturbations in the orbits of the minor planets and searched the night sky with Morcom's telescope. In December 1929 both students rode the train to Cambridge to sit the entrance scholarship examinations for Trinity College. Morcom won an open scholarship, while Turing fell short on his first attempt.
Back at Sherborne in February 1930, Morcom collapsed with severe abdominal pain caused by bovine tuberculosis. He had contracted the infection years earlier from drinking contaminated cow's milk. After two emergency operations in a London nursing home, Morcom died on February 13, 1930. The loss forced Turing to confront a problem that merged personal grief with mathematical physics. How could a human mind, with its distinct memories and habits of thought, depend on a fragile collection of biological cells?
Between 1930 and 1932, in letters and a short manuscript titled Nature of Spirit written for Christopher's mother, Sara Morcom, Turing worked through four stages of a mechanistic theory of mind:
- * Rejection of Laplacian fatalism: Under classical Newtonian mechanics, the positions and momenta of all particles at one instant fix every future movement of the body, leaving zero room for autonomous judgment.
- * Eddington's quantum indeterminacy: Drawing on Cambridge astrophysicist Arthur Stanley Eddington's 1928 lectures on wave mechanics and Werner Heisenberg's uncertainty principle, Turing noted that atomic transitions follow probabilistic wavefunctions rather than rigid trajectories.
- * The brain as an amplifier of micro-states: Because neural pathways sit near unstable physiological thresholds, microscopic quantum fluctuations can tip a macroscopic cascade of nerve impulses toward one action rather than another.
- * Identity as transferable state organization: What defines an individual mind is not the specific carbon or oxygen atoms in the skull, but the logical configuration of states that could bind to a new physical substrate.
Turing won a mathematics scholarship to King's College, Cambridge in late 1930 and enrolled in October 1931. By then, his metaphysical speculation was already hardening into a scientific program. That shift from grieving a disembodied soul to asking how physical matter stores and executes a mind's state vector guided every machine Turing designed from Cambridge to Manchester.