Descartes formulated the law of refraction of light, which deduces the angle of refraction [deflection] of light through a medium from the lights' angle of incidence and the speed of light in each media in which the light passes. This explained why a rainbow is circular. In 1644, he described the universe in terms of matter and motion and suggested that there were universal laws and an evolutionary explanation for such. He opined that all effects in nature could be explained by spatial extension and motion laws that 1) each part of matter retains the shape, size, motion, or rest unless collision with another part occurs; 2) one part of matter can only gain as much motion through collision as is lost by the part colliding with it; and 3) motion tends to be in a straight line. Descartes feared persecution by the church because his ideas did not correlate with the Biblical notion of God's creation of the universe in the order of light, then sky and oceans and dry land, then plants, then seasons and the sun and moon and stars, then fish and birds, then all animals, and finally man. Descartes believed in a good and perfect God, and thought of the world as divided into matter and spirit. The human mind was spirit and could exist outside the human body. Without the mind, human body was a machine. The human mind had knowledge without sense experience, e.g. the truths of mathematics and physics. Ideas and imagination were innate. His observation that sensory appearances are often misleading, such as in dreams or hallucinations, led him to the conclusion that he could only conclude that: "I think, therefore I am." He rejected the doctrine that things had a proper behavior according to their natures, e.g. the nature of acorns is to develop into oak trees. As an example of erroneous forming of conceptions of substance with our senses alone, he pointed out that honeycomb has a certain taste, scent, and texture, but if exposed to fire, it loses all these forms and assumes others. He considered to be erroneous the belief that there are no bodies around us except those perceivable by our senses. He was a strong proponent of the deductive method of finding truths, e.g. arguing logically from a very few self- evident principles, known by intuition, to determine the nature of the universe.
Christian Huygens, a Dutch physicist, used the melting and the boiling point of water as fixed points in a scale of measurements, which first gave definiteness to thermometric tests.
There was much mining of coal, tin, copper, lead, and iron in the 1600s. Coal was transported from the coal pits down to the rivers to be loaded onto ships on coal wagons riding on wooden rails. The full coal cars could then be sent down by gravity and the empty wagons pulled up by horses. Sheet metal, e.g. lead, was used for roofing. Coal was much used for heating houses, and for laundry, cooking, and industrial use, such as extraction of salt, soap boilers, and manufacture of glass, bricks and tiles for buildings, anchors for ships, and tobacco pipes. It was used in the trades: bakers, confectioners, brewers, dyers, sugar refiners, coopers, starch makers, copper workers, alum makers, and iron workers.
In 1604 the Haberdashers, who sold imported felt for hats, got a charter of incorporation.
A tapestry factory was established in 1619.
Flax-working machines came into existence.
As Attorney General, Edward Coke was impassioned and melodramatic. He once described the parts of the penalty of treason as follows: being drawn to the place of execution reflected the person's not being worthy any more to tread upon the face of the earth; being drawn backward at a horse tail was due to his retrograde nature; being drawn head downward on the ground indicated that he was unfit to breathe the common air; being hanged by the neck between heaven and earth indicated that he was unworthy of either; being cut down alive and his privy parts cut off and burnt before his face indicated he was unworthily begotten and unfit to leave any generation after him; having his bowels and inners taken out and burnt indicated he had inwardly conceived and harbored such horrible treason; his head cut off, which had imagined the treason, and his body to be quartered and the quarters set up to the view and detestation of men a prey for the fowls of the air. Coke was subsequently elevated to the position of Chief of Common Pleas and then to Chief of the King's Bench. But there Coke propounded a doctrine of the supremacy of the law over the king as well as over Parliament. For instance, Coke would not agree to stay any case in which the king had a concern in power or profit, to consult with him. But the other eleven justices did agree. Since James I believed in the divine right of kings, he therefore dismissed Coke from his position as Chief Justice of the King's Bench. James even believed that he could suspend any law for reasons known only to him and issue proclamations that were not limited to the reinforcement of old laws, but made new offenses with punishment of fine and/or imprisonment.
Coke then became a member of Parliament and led the Commons, where he exalted the authority of Parliament vis a vis the king; that is, the king could not make any changes in law, religion, or taxation without consent of Parliament. James arrested Coke and two other members of the Commons and put its leader John Pym under house arrest for their outspoken opinions against the King's intended alliance with Catholic Spain and intended taking of a Spanish wife. Because of the deadlock that developed between the king and Parliament, certain matters could not be addressed by legislation and were left to be decided judicially. This made judicial review of disputes important.
James vastly increased the number of peerages, selling many, for example for 10,000 pounds. Since there was a tacit understanding that members of Parliament would not accept remuneration, this restricted eligibility for membership to the rich. The House of Commons was composed mostly of attorneys, merchants from the large towns, and country gentlemen. The gentry members had 600 pounds [12,000s] annual income from land and the burgess members had 300 pounds [6,000s.] In addition to the two knights from every county (elected by men holding at least forty-shilling freeholds), four representatives from London, and one or two from every other borough (generally elected by the top business families), there was a representative from each of the two universities. For Speaker, they always chose someone suggested to them by the Crown. He decided who would talk and could hasten or delay bills, usually for the benefit of the Crown. The Clerk, a lifetime appointment of the Crown, wrote out the bills and their amendments and kept track of proceedings. Many in the Commons were Puritan in sympathy. In 1607, the House of Commons developed a committee system to avoid being presided over by the royally designated speaker. A committee could consist of all the members of the House of Commons with an elected chairman. An increasing number of issues were discussed in committee before coming to the Commons and the Commons came to ratify readily what had been done in committee.
By 1610, there had developed in the House of Commons an opposition to feudal tenures, purveyance, wardships, and impositions (special import and export duties on aliens set by the king without the consent of Parliament that were supposed to be for the purpose of regulating trade instead of for revenue). There was also a call for free speech and an end to the King's habit at the end of Parliament of imprisoning for a time those who had been too outspoken. The Commons also asserted itself into foreign affairs by expressing an opinion against a treaty proposed by the king on which war could ensue. The treaty was abandoned. In London, organized groups such as the apothecaries, the skinners, and the grocers, were circulating printed statements of their cases to members of committees of the House of Commons rather than just seeking out a friendly Privy Council member. In 1621, the protests made to committeemen about monopolies sold by James frightened him into canceling many of them. He had made many grants against competition in violation of law. The right of the Commons to expel a member was asserted by the expulsion of a monopolist. By 1629, the speeches of prominent members and the course of proceedings were copied by stationers and sold in a weekly news report.