The Scientific Method’s Renaissance Roots

The Scientific Method is the foundation of modern science. It is the process by which scientists observe the natural world, form hypotheses, test them through experiment, and refine their understanding in light of the results. Although the Scientific Method was formally articulated in the 17th century, its roots lie in the Renaissance. The recovery of ancient texts, the development of new instruments, the rise of the experimental tradition, and the conviction that the natural world could be understood through reason all combined in the Renaissance to produce the intellectual soil from which the Scientific Method grew.

What Is the Scientific Method?

The Scientific Method is not a single, fixed procedure but a set of principles and practices that have been refined over centuries. The key elements include:

• Direct observation of natural phenomena, rather than reliance on authority or tradition.
• Careful description of what is observed, with attention to detail and to the conditions of observation.
• Hypothesis formation, in which a tentative explanation is proposed to account for the observations.
• Experimentation, in which the hypothesis is tested under controlled conditions.
• Mathematical description, in which the results are expressed in numerical or symbolic form, allowing precise prediction.
• Peer review and replication, in which other scientists repeat the experiments and verify the results.
• Revision of hypotheses in light of new evidence.

This set of practices distinguishes modern science from earlier approaches to natural knowledge, such as the medieval Scholastic tradition, which relied heavily on the authority of ancient texts, and the magical or alchemical traditions, which relied on symbolic or mystical correspondences.

Medieval Precursors

The Scientific Method didn’t emerge out of nowhere. The medieval Scholastic tradition, despite its reliance on ancient authority, had developed a sophisticated method for reconciling different sources of knowledge. The great Scholastic thinkers, including Robert Grosseteste, Roger Bacon, and Thomas Aquinas, had developed techniques for observation, classification, and logical argument that would prove essential to the development of modern science.

Robert Grosseteste (c. 1175–1253), the bishop of Lincoln, was an important precursor of the Scientific Method. He emphasized the importance of observation and experiment, and he proposed that knowledge should be tested by comparing predictions with observations. His method, derived in part from the geometry of Euclid and the optics of Ibn al-Haytham, was an early statement of the empirical approach.

Roger Bacon (c. 1214–1294), a Franciscan friar, was another important precursor. He emphasized the importance of experience — both the ordinary experience of the senses and the more controlled experience of experiment. He proposed that mathematics was the key to understanding nature, and he called for the development of experimental methods to test hypotheses.

Thomas Aquinas (1225–1274), the great Scholastic theologian, developed a sophisticated method for synthesizing faith and reason. His Summa Theologica used a structured approach to questions — objection, counter-argument, response, and reply to objections — that has been compared to the structure of a scientific paper.

The Recovery of Ancient Science

The Renaissance recovery of ancient Greek scientific texts was crucial to the development of the Scientific Method. The works of Aristotle, the most important natural philosopher of antiquity, had been preserved in the Latin West during the Middle Ages, but many of the other great Greek scientific texts — including the works of Archimedes, Euclid, Ptolemy, Galen, and Hippocrates — had been lost or were available only in poor Arabic translations.

Beginning in the 14th and 15th centuries, humanist scholars worked to recover the Greek scientific texts in their original form. They learned Greek, traveled to Byzantine libraries, and commissioned translations. The result was a new, more accurate understanding of ancient science, and a new appreciation of the empirical tradition that had existed in antiquity.

The works of Archimedes (c. 287–212 BC), the Greek mathematician and engineer, were particularly important. Archimedes had developed a sophisticated method for combining observation, mathematical description, and physical reasoning, and his work became a model for the new science. The works of Galen (c. 129–c. 216 AD) and Hippocrates (c. 460–c. 370 BC) were similarly important for the development of medicine.

The Rise of the Experimental Tradition

The Renaissance also saw the development of an experimental tradition, in which natural philosophers performed hands-on investigations of the natural world. This tradition was an important departure from the medieval Scholastic approach, which had relied primarily on the reading and interpretation of texts.

The Florentine Platonic Academy, founded by Marsilio Ficino under the patronage of Cosimo de’ Medici, was an important center of the experimental tradition. The academy’s members conducted experiments in alchemy, medicine, and natural magic, and they helped to develop the idea that the natural world could be understood through direct investigation.

The Tuscan court, especially under the Medici, supported the experimental tradition. The grand dukes of Tuscany, including Cosimo I and Francesco I, established laboratories and workshops where alchemists, naturalists, and instrument makers could work. The Opificio delle Pietre Dure, founded in 1588, was a famous workshop that combined artistic and scientific work.

Galileo Galilei: The Empiricist

Galileo Galilei (1564–1642) is often considered the father of the modern Scientific Method. Working at the University of Padua and later in Florence, Galileo combined careful observation, mathematical description, and controlled experiment to produce a new kind of natural philosophy.

Galileo’s approach to science is best illustrated by his studies of motion. He performed careful experiments with inclined planes and pendulums, measuring the motion of falling bodies and the period of pendulums. He used these observations to derive mathematical laws of motion, including the law of falling bodies (the distance fallen is proportional to the square of the time) and the law of the pendulum (the period is approximately independent of the amplitude, for small amplitudes).

Galileo’s method is well illustrated by his work on the moons of Jupiter. In 1610, using his newly improved telescope, he observed four small bodies orbiting Jupiter. He made careful observations over several nights, recording the positions of the moons and the times of their eclipses. From these observations, he derived the orbital periods of the moons, demonstrating that the same laws that govern motion on Earth also govern motion in the heavens.

Galileo was also an important publicist for the new science. His Dialogue Concerning the Two Chief World Systems (1632) presented the arguments for and against the Copernican model in the form of a conversation among three characters, with the Copernican view ultimately winning. The book, written in Italian rather than Latin, made the new science accessible to a wide audience.

Francis Bacon: The Inductive Method

The English philosopher Francis Bacon (1561–1626) was the most important theorist of the Scientific Method in the early 17th century. His Novum Organum (New Organon, 1620), a critique of Aristotelian logic, laid out a new method of inquiry that emphasized induction rather than deduction.

Bacon’s method begins with careful observation of nature, the collection of facts, and the organization of these facts into tables. From the tables, the investigator draws general conclusions through a process of induction — moving from particular observations to general laws. The conclusions are then tested through further observation and experiment.

Bacon’s method was influential in shaping the institutional development of science. The Royal Society of London, founded in 1660, was explicitly Baconian in its approach. The Society’s motto, Nullius in verba (“On no one’s word”), reflected Bacon’s insistence on direct observation rather than deference to authority.

Bacon’s vision of science was also practical. He believed that science should be useful, that it should improve the human condition through the development of new technologies. The phrase “knowledge is power,” which Bacon popularized, captured his conviction that the mastery of nature through science would benefit humanity.

René Descartes: The Mathematical Method

The French philosopher René Descartes (1596–1650) developed a different approach to the Scientific Method, one that emphasized deduction and mathematical reasoning. His Discourse on Method (1637) and Meditations on First Philosophy (1641) laid out a method of inquiry that began with radical doubt and then built up knowledge from indubitable first principles.

Descartes’s method was based on four rules:

1. Accept nothing as true that’s not clearly and distinctly known to be so.
2. Divide each difficulty into as many parts as possible.
3. Conduct thoughts in order, beginning with the simplest and moving to the most complex.
4. Make enumerations so complete and reviews so general that nothing is omitted.

Descartes combined his method with a profound commitment to mathematical reasoning. He believed that the natural world could be understood as a kind of mathematical system, governed by laws that could be expressed in mathematical form. His work in geometry, including the development of analytic geometry, provided a powerful tool for the new science.

Descartes’s mechanical philosophy treated the natural world as a machine, governed by mathematical laws. He rejected the Aristotelian view that the natural world had purposes or goals, and he proposed instead that natural phenomena could be explained by the motion of particles and the laws of mechanics. This approach was extremely influential in the 17th and 18th centuries, and it shaped the development of modern physics.

The Experimental Philosophy in Practice

The Scientific Method, as it developed in the 17th century, was a combination of the approaches of Galileo, Bacon, Descartes, and others. The new scientists combined careful observation, controlled experiment, mathematical description, and a commitment to revising their theories in light of new evidence.

The institutions of modern science — the universities, the academies, the scientific societies, the journals — were products of this period. The Royal Society of London, the French Academy of Sciences, and similar institutions in Italy, Germany, and elsewhere provided the social and intellectual framework for the new science.

The new science transformed the Western world. The discoveries of Galileo, Kepler, Newton, and others demonstrated the power of the Scientific Method to reveal the structure of the natural world. The new technology — the telescope, the microscope, the barometer, the air pump, the thermometer — extended the range of human observation and made possible discoveries that would have been impossible in earlier centuries.

The Legacy of the Scientific Method

The Scientific Method, born in the Renaissance and developed in the 17th century, is one of the great achievements of Western civilization. It has transformed our understanding of the natural world, from the smallest subatomic particles to the largest structures of the cosmos. It has produced technologies that have reshaped human life, from the steam engine to the smartphone.

The Scientific Method is also a model of rational inquiry that extends beyond the natural sciences. The emphasis on evidence, on the testing of hypotheses, on the revision of theories in light of new data, has influenced fields as diverse as history, economics, and medicine. The Scientific Method, in a real sense, is the foundation of the modern world.

The sources listed below are not exhaustive. They are the ones I would actually hand to a student who wanted to keep going on their own.

An honest gap. The standard accounts of this period are, in many ways, the accounts of the literate, the urban, and the relatively well-off. The picture you get from the literature is necessarily a partial one, and any responsible overview has to flag the parts it is leaving out.

Sources & further reading

For non-specialists, the most accessible single book on this topic is usually the first in the list. The other two are denser but more thorough.

• Peter Dear, Revolutionizing the Sciences: European Knowledge and Its Ambitions, 1500-1700 (2001; rev. 2009)
• John Henry, The Scientific Revolution and the Origins of Modern Science (2002; many reprints)
• Steven Shapin, The Scientific Revolution (1996)

If you want to go further, the bibliographies at the back of any of these books will lead you to the scholarly literature. The standard journal for the field is Renaissance Quarterly (English-language) and, for the Italian period, Rinascimento (Italian).