Here is a fact that should keep you up at night: the most important scientific book ever written almost did not get published. Not because it was controversial (though it was). Not because the author lost the manuscript (though that happened too, sort of). It almost did not get published because the Royal Society of London had blown its entire budget on a lavishly illustrated book about fish.
The book that almost never was? Isaac Newton’s Philosophiae Naturalis Principia Mathematica, the work that unified terrestrial and celestial mechanics, laid the foundations of classical physics, and changed humanity’s understanding of the universe forever. And the man who saved it was not a wealthy patron or a powerful politician. It was Edmond Halley, an astronomer of modest means who would later become famous for predicting the return of a comet.
This is a story about friendship, stubbornness, and the strange economics of genius.
The Problem That Started Everything
In January 1684, three men sat in a London coffee house arguing about gravity. Edmond Halley, Robert Hooke, and Christopher Wren (yes, the architect of St. Paul’s Cathedral) were trying to solve a problem that had nagged astronomers for years. Johannes Kepler had shown that planets move in ellipses around the Sun, but nobody could explain why. What force could produce elliptical orbits?
The three men suspected the answer involved an inverse-square law, a force that weakens with the square of the distance. But none of them could prove it mathematically. Hooke, never one for modesty, claimed he had solved it but was keeping the proof secret. Wren, skeptical, offered a prize of a book worth 40 shillings to whoever could produce a real demonstration within two months.
Nobody collected.
That August, Halley decided to visit the one person in England who might actually be able to solve the problem. He traveled to Cambridge and knocked on the door of Isaac Newton.
The Famous Visit
What happened next is one of the most celebrated moments in the history of science. Halley asked Newton what curve a planet would follow if the force of gravity decreased with the square of the distance. Newton answered immediately: an ellipse.
Halley was stunned. How did he know?
“I have calculated it,” Newton replied.
But when Newton rummaged through his papers, he could not find the proof. He promised to redo the calculation and send it to Halley. True to his word, a few months later Newton sent Halley a short treatise called De Motu Corporum in Gyrum (On the Motion of Bodies in Orbit). It was nine pages long, and it was extraordinary.
Halley immediately recognized what he was looking at. This was not just a solution to the elliptical orbit problem. This was the beginning of something far larger: a complete mathematical description of motion and gravity. He urged Newton to expand the work into a full book.
Newton, once set in motion, proved very difficult to stop.
Eighteen Months of Furious Writing
Between 1685 and 1687, Newton produced the Principia in a burst of almost superhuman productivity. He barely ate, barely slept, and barely spoke to anyone. His assistant Humphrey Newton (no relation) later recalled that the professor would sometimes forget meals entirely, and would sit on the edge of his bed in the morning, struck by a thought, and remain there for hours without dressing.
The work poured out in three books:
- Book I established the laws of motion and the mathematics of gravitational attraction
- Book II dealt with the motion of bodies through resisting media, fluids and gases
- Book III applied the theory to the real universe, explaining planetary orbits, the tides, the shape of the Earth, and the paths of comets
Throughout this process, Halley served as editor, cheerleader, diplomat, and therapist. This last role turned out to be critically important, because midway through the project, everything nearly fell apart.
The Hooke Problem
When the Royal Society received Newton’s manuscript for Book I, Robert Hooke immediately claimed that Newton had stolen the idea of the inverse-square law from him. Hooke insisted that he deserved credit, significant credit, in the published work.
Newton’s reaction was volcanic. He was furious. He threatened to suppress Book III entirely, the very book that applied his theory to the cosmos, the part that made the Principia the Principia. Without it, the work would have been a mathematical treatise of interest to specialists. With it, it was a revolution.
Halley stepped in with extraordinary diplomatic skill. He wrote Newton careful, flattering, soothing letters. He acknowledged that Hooke’s behavior was unreasonable. He gently pointed out that withholding Book III would punish the world more than it would punish Hooke. Gradually, Newton calmed down. He did remove most references to Hooke from the text, a petty revenge, perhaps, but at least the book survived intact.
The Fish Book Problem
And then came the money problem.
The Royal Society had agreed in principle to publish the Principia. But when the time came to actually pay the printer, the Society’s coffers were empty. The culprit was De Historia Piscium, Francis Willughby’s History of Fishes, a beautifully illustrated natural history that the Society had published in 1686. It was an expensive production, and it had not sold well. The Society was so strapped for cash that when Halley was appointed clerk in 1686, part of his salary was paid in unsold copies of the fish book.
Let that sink in for a moment. The organization responsible for publishing what would become the foundation of modern physics was paying its employees in leftover fish books.
Halley decided to fund the publication himself. This was not a trivial commitment. He was not wealthy. He had a family to support. The printing costs were substantial, likely between 50 and 60 pounds, equivalent to perhaps 10,000 to 15,000 pounds today. For a working astronomer, this was an enormous sum.
But Halley paid. He oversaw the printing. He corrected proofs. He wrote a laudatory ode to Newton that appeared at the front of the book (in Latin verse, naturally). And in July 1687, the Principia was published.
What Halley Made Possible
It is difficult to overstate the impact of the book Halley shepherded into existence. The Principia did not just describe gravity. It created a new way of doing science. Newton demonstrated that the same mathematical laws governed both the fall of an apple and the orbit of the Moon. The heavens and the Earth obeyed the same physics.
The consequences rippled outward for centuries:
- Halley himself used Newton’s methods to predict the return of what we now call Halley’s Comet, providing one of the first great confirmations of Newtonian mechanics
- The Principia enabled the precise prediction of planetary positions, essential for navigation and exploration
- It laid the groundwork for the engineering of the Industrial Revolution
- Einstein’s general relativity, which refined Newton’s gravity, was explicitly framed as an extension of the Principia’s framework
- When NASA calculated trajectories for the Apollo missions, they used Newtonian mechanics for nearly everything
All of this from a book that was almost derailed by a petty rivalry and a publishing budget spent on fish.
The Character of Halley
Edmond Halley deserves far more recognition than he typically receives. Most people know him only for his comet, and even that recognition is slightly unfair. He did not discover the comet; he merely predicted its return. But his contributions to science were vast and varied.
Before the Principia affair, Halley had already catalogued the stars of the southern hemisphere from the island of St. Helena, made fundamental contributions to the understanding of trade winds and monsoons, and created some of the first thematic maps. After it, he would go on to calculate the distance to the Sun using transits of Venus, pioneer actuarial science with his life tables, and command a Royal Navy vessel on a scientific expedition.
But his greatest contribution may have been simply recognizing Newton’s genius and having the persistence (and the wallet) to bring it to the world. In an era without research grants, without university presses, without government funding for science, the fate of knowledge often depended on individuals willing to bet their own money on ideas they believed in.
Patronage, Publishing, and the Life of Ideas
The story of how the Principia got published is a reminder that great ideas are fragile. They depend not just on the genius who conceives them, but on the ecosystem that supports them: the editors, the publishers, the patrons, the friends who say “you really need to write this down.”
Newton, left to his own devices, might never have published the Principia. He was secretive, easily offended, and prone to abandoning projects when they became politically complicated. Without Halley’s visit in 1684, the inverse-square law proof might have stayed in a drawer in Cambridge forever. Without Halley’s diplomacy, Book III might have been suppressed. Without Halley’s money, the whole thing might have waited years for funding that might never have come.
The physical book itself mattered too. The Principia was not just a set of ideas. It was a carefully designed object, with diagrams and typeset mathematics that conveyed meaning through their visual arrangement. If you want to experience the weight and beauty of Newton’s work as a physical object, Kronecker Wallis has produced a stunning edition of Newton’s Principia that honors both the science and the craft of the original.
Newton’s later optical work, which he also took years to publish (partly because he dreaded the inevitable criticism from Hooke), is available in Kronecker Wallis’s edition of Newton’s Opticks. And for a broader look at how scientists have communicated their discoveries through beautiful visual representations, Portraying Science offers a fascinating journey through centuries of scientific illustration.
The Debt We Owe
Halley never got rich from publishing the Principia. The first edition eventually sold out, but we do not know whether he ever recovered his full investment. He certainly never complained about it publicly. He seems to have considered it simply the right thing to do.
There is something deeply moving about that. In a world where Newton and Hooke bickered endlessly about priority and credit, Halley just quietly got things done. He saw what needed to happen, and he made it happen. He spent his own money, soothed bruised egos, corrected proofs, and wrote encouraging letters. All so that the world could have a book that its own author was too difficult and too proud to publish on his own.
The next time you look up at the night sky and see a world governed by knowable, predictable laws, spare a thought for the astronomer who paid for that knowledge out of his own pocket. And for the fish book that nearly stopped him.
No products in the cart.