There is a peculiar injustice in the history of science. Robert Hooke – who discovered cells, formulated the law of elasticity, rebuilt London after the Great Fire, and pioneered the microscope as a scientific instrument – has no confirmed portrait. Not a single likeness survived into the modern era with certainty. The man who revealed the invisible architecture of life was himself rendered invisible by history. For nearly three centuries, his name was a footnote, his achievements absorbed into the reputations of others. That he has been recovered at all is the work of stubborn scholars and primary sources that refused to disappear.
Hooke was born on 18 July 1635 in Freshwater on the Isle of Wight, the youngest child of the Reverend John Hooke. Frail as a child and not expected to survive, he was left largely to his own devices. He built a working wooden clock from a dismantled brass one and drew constantly, watching the portrait painter John Hoskyns at work. After his father’s death in 1648, Robert was sent to Westminster School, where the headmaster Richard Busby recognised something remarkable: Hooke mastered the first six books of Euclid’s Elements in his first week. By 1653, he had secured a place at Christ Church, Oxford.
The Royal Society’s Engine Room
Oxford in the 1650s was the crucible of England’s scientific revolution. The Philosophical Club – later the nucleus of the Royal Society – met with John Wilkins, Robert Boyle, Christopher Wren, and William Petty. Through Wilkins, Hooke was introduced to Boyle, who needed an assistant to construct the air pump for his experiments on gases. Hooke did not merely copy the existing design. He improved it substantially, creating what was essentially the modern air pump.
In June 1663, Hooke was elected Fellow of the Royal Society. From 1662, he had served as its first Curator of Experiments – a role he held for four decades. On 20 March 1665, he was appointed Gresham Professor of Geometry, a post he maintained until his death. The Royal Society’s records confirm that the observations compiled for Micrographia were “largely based on requests made over the previous year by Fellows at meetings of the Society.”
Micrographia and the Word ‘Cell’
Published in January 1665, Micrographia: or Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses was the first major publication of the Royal Society and the first scientific bestseller. Samuel Pepys, reading it on 21 January 1665, wrote: “before I went to bed I sat up till 2 a-clock in my chamber, reading of Mr. Hookes Microscopicall Observations, the most ingenious book that ever I read in my life.”
The book contained thirty-eight copperplate engravings – fold-out plates of insects that dwarfed the folio itself, the louse folding out to four times the book’s size. But its most enduring contribution lies in Observation 18, where Hooke examined cork under his microscope: “I could exceedingly plainly perceive it to be all perforated and porous, much like a Honey-comb… these pores, or cells… were indeed the first microscopical pores I ever saw, and perhaps, that were ever seen.” The word “cell” entered biology in that moment. Beyond biology, Micrographia contained a wave theory of light, lunar crater observations (concluding the Moon must have its own gravity), and the first recorded hypothesis of heat expansion. In 1664 Hooke discovered Gamma Arietis, one of the first recorded double stars.
Rebuilding London
On 2 September 1666, the Great Fire destroyed 13,200 houses, 87 churches, and most of the City. Hooke submitted a rebuilding plan to the Royal Society less than a week later – a grid pattern with wide boulevards. Charles II rejected all such proposals; the cost was prohibitive and the city needed trade restored quickly. Hooke was appointed Surveyor to the City of London, and for seven years performed more than half of the property line surveys required to rebuild.
As Lisa Jardine documented: “in the four weeks from the 4th of October, [Hooke] helped map the fire-damaged area, began compiling a Land Information System for London, and drew up building regulations for an Act of Parliament to govern the rebuilding.” Stephen Inwood observed that “the surveyors’ reports, which were generally written by Hooke, show an admirable ability to get to the nub of intricate neighbourly squabbles, and to produce a crisp and judicious recommendation from a tangle of claims and counter-claims.”
As chief assistant to Christopher Wren, Hooke designed the Monument to the Great Fire (completed 1677, usually attributed to Wren but confirmed by Hooke’s diaries as his design), Montagu House in Bloomsbury, Bethlem Royal Hospital, the Royal College of Physicians on Warwick Lane, and numerous churches. From 1671 to 1696, Wren’s office paid Hooke £2,820 in fees – more than he ever earned from the Royal Society.
The Monument itself was intended to serve a dual purpose: a Doric column of Portland stone, 202 feet high, marking the distance from Pudding Lane where the fire began, with a hollow interior designed as a zenith telescope for astronomical observation. The vibrations from nearby traffic proved this impractical, but even a memorial to catastrophe was an instrument for scientific inquiry.
Hooke’s Law
Hooke’s law of elasticity – ut tensio, sic vis: as the extension, so the force – is one of the foundational principles of materials science. He discovered the relationship around 1660 while working on balance springs for clocks, concealing it first as a Latin anagram (ceiiinosssttuu) in 1676 before revealing the full statement in 1678. The law states that the stretching of a solid body is directly proportional to the force applied, within the elastic limit. It underpins the spring scale, the manometer, the balance wheel of the mechanical clock, and the modern theory of elasticity.
Fossils and Extinction
Hooke was the first person to examine fossils under a microscope. Comparing petrified wood to rotten oak, he concluded that mineral-rich water deposited minerals through organic pores, turning material to stone. In Micrographia and later in his Discourse of Earthquakes, he argued that shell-like fossils on mountaintops were remains of once-living organisms – not “sports of nature” or stones generated by an “extraordinary Plastick virtue” within the Earth.
This led to a radical conclusion: species could disappear. “There have been many other Species of Creatures in former Ages, of which we can find none at present,” he wrote, “and that ’tis not unlikely also but that there may be divers new kinds now, which have not been from the beginning.” He grasped the cardinal principle of palaeontology – that the fossil record documents the history and changes of life on Earth – two and a half centuries before Darwin.
The Newton Feud
The relationship between Hooke and Isaac Newton was poisoned by two disputes: the inverse square law of gravitation and the wave theory of light. In 1679–1680, Hooke wrote to Newton proposing the idea of “compounding the celestial motions of the planets of a direct motion by the tangent & an attractive motion towards the central body.” Newton, who had largely abandoned astronomical work, was provoked into renewed activity. He later acknowledged to Edmond Halley that Hooke’s “dogmaticalness in writing as if he had found the motion in the Ellipsis” had inclined him to attempt the proof himself.
When Newton’s Principia Mathematica was presented to the Royal Society in 1686, Hooke accused him of plagiarism. Newton was furious, writing to Halley: “he [Hooke] has done nothing and yet written in such a way as if he knew and had sufficiently hinted all but what remained to be determined by the drudgery of calculations and observations.” The modern consensus is nuanced: the inverse square hypothesis predated both men, and Newton’s mathematical demonstration was the critical contribution. Yet Hooke’s concept of compounding tangential and centripetal motion was significant, and Newton’s refusal to acknowledge it remains a stain on his legacy.
The dispute over light was equally acrimonious. When Newton presented his theory of colour in 1672, Hooke criticised it in detail, defending his own wave theory. The exchange deepened the personal animosity between them.
Erasure and Recovery
Hooke died on 3 March 1703, blind and bedridden. A chest containing £8,000 in money and gold was found in his room at Gresham College, along with over 3,000 books. No will was discovered; the money passed to a cousin, Elizabeth Stephens.
Newton became President of the Royal Society in the same year. Under his presidency, none of Hooke’s thousands of instruments and models survived. The Society moved to Crane Court in 1710, and a portrait of Hooke seen by the German traveller Zacharias Conrad von Uffenbach in that year vanished during the move. As the Royal Society’s blog noted in 2010, “several visitors to the Society’s 350th anniversary exhibition… commented, ‘they say Newton destroyed a portrait of Hooke’.” The historian Allan Chapman offered: “I would not have trusted Newton with a box of matches anywhere near it.”
What is not in doubt is that Newton worked systematically to diminish Hooke’s reputation. As Michael Cooper of City University observed: Newton “denied many of Hooke’s contributions and did all that he could to obliterate them from history.”
The modern reappraisal began in the late twentieth century. Lisa Jardine’s The Curious Life of Robert Hooke (2003) and Stephen Inwood’s The Forgotten Genius (2003) brought him back into public view. The tercentenary of his death prompted a conference at the Royal Society. The Robert Hooke Society in Freshwater maintains an exhibition and an 8.5-mile Hooke Trail on the Isle of Wight. The Hooke crater on the Moon, 36 kilometres in diameter, bears his name, as does the asteroid 3514 Hooke. At Imperial College London, a building commemorates him.
Robert Hooke was, as Allan Chapman argued, “the first major British scientific figure to do science” – the first to demonstrate how the experimental method, using instruments, produces progressive knowledge. That he was forgotten is a testament to the power of institutional memory and to the singular influence of Isaac Newton. That he has been recovered is a testament to the persistence of evidence – the diaries, the letters, the architectural drawings, the Royal Society minutes – that resisted erasure. In a culture that values the visible and the celebrated, Hooke reminds us that the most consequential discoveries are often made by those who look at what others overlook: the pores of a piece of cork, the fossils in a stone, the invisible force that stretches a spring.
