SARTON SAYS SO (ABOUT VALUE OF PRE-RENAISSANCE ISLAMIC SCIENCE)
George Leon Arthor Sarton (1884-1956) has been praised as "the father of the history of science" (http://www.garfield.library.upenn.edu/essays/v8p241y1985.pdf). In 1912, Sarton founded the distinguished journal, Isis, and in 1936 another, Osiris. His History of Science , and ancillary works, are essential tools of the scholar.

In 1936, Sarton wrote The Study of the History of Science, a varsion of his inaugural lectures at Harvard University. Among other comments:

"... we shall not be able to understand our science of to-day (I do not say to use it, but to understand it) if we do not succeed in penetrating its genesis and its evolution. Knowledge is not something dead and static, but something fluid, alive, and moving. The latest results are like the fruits of a tree; the fruits serve our immediate practical purposes, but for all that it is the tree that matters. The scientist of philosophic mind is not interested so much in the latest results of science as he is in its eternal tendencies, In the living and exhuberant and immortal tree. The fruits of to-day may be tempting enough, but they are not more precious to his way of thinking than those of yesterday or to-morrow."

Here is George Sarton's Tribute to Muslim Scientists in his book, Introduction to the History of Science I (my underlining):
"It will suffice here to evoke a few glorious names without contemporary equivalents in the West (my seprate listing): A magnificent array of names which it would not be difficult to extend. If anyone tells you that the Middle Ages were scientifically sterile, just quote these men to him, all of whom flourished within a short period, 750 to 1100 A.D."

More generally, George Sarton said in his epochal Introduction to the History of Science: "During the reign of Caliph Al-Mamun (813-33 A.D.), the new learning reached its climax. The monarch created in Baghdad a regular school for translation...."

"The Muslim ideal was, it goes without saying, not visual beauty but God in His plentitude; that is God with all his manifestations, the stars and the heavens, the earth and all nature. The Muslim ideal is thus infinite. But in dealing with the infinite as conceived by the Muslims, we cannot limit ourselves to the space alone, but must equally consider time.

"The first mathematical step from the Greek conception of a static universe to the Islamic one of a dynamic universe was made by Al-Khwarizmi (780-850), the founder of modern Algebra. He enhanced the purely arithmetical character of numbers as finite magnitudes by demonstrating their possibilities as elements of infinite manipulations and investigations of properties and relations.

"In Greek mathematics, the numbers could expand only by the laborious process of addition and multiplication. Khwarizmi's algebraic symbols for numbers contain within themselves the potentialities of the infinite. So we might say that the advance from arithmetic to algebra implies a step from being to 'becoming' from the Greek universe to the living universe of Islam. The mportance of Khwarizmi's algebra was recognized, in the twelfth century, by the West, - when Girard of Cremona translated his theses into Latin. Until the sixteenth century this version was used in European universities as the principal mathematical text book. But Khwarizmi's influence reached far beyond the universities. We find it reflected in the mathematical works of Leonardo Fibonacci of Pisa, Master Jacob of Florence, and even of Leonardo da Vinci."

"Through their medical investigations they not merely widened the horizons of medicine, but enlarged humanistic concepts generally. And once again they brought this about because of their over riding spiritual convictions. ... If it is regarded as symbolic that the most spectacular achievement of the mid-twentieth century is atomic fission and the nuclear bomb, likewise it would not seem fortuitous that the early Muslim's medical endeavor should have led to a discovery that was quite as revolutionary though possibly more beneficent."

"A philosophy of self-centredness, under whatever disguise, would be both incomprehensible and reprehensible to the Muslim mind. That mind was incapable of viewing man, whether in health or sickness as isolated from God, from fellow men, and from the world around him. It was probably inevitable that the Muslims should have discovered that disease need not be born within the patient himself but may reach from outside, in other words, that they should have been the first to establish clearly the existence of contagion."

"One of the most famous exponents of Muslim universalism and an eminent figure in Islamic learning was Ibn Sina, known in the West as Avicenna (981-1037). For a thousand years he has retained his original renown as one of the greatest thinkers and medical scholars in history. His most important medical works are the Qanun (Canon) and a treatise on Cardiac drugs. The 'Qanun fi-l-Tibb' is an immense encyclopedia of medicine. It contains some of the most illuminating thoughts pertaining to distinction of mediastinitis from pleurisy; contagious nature of phthisis; distribution of diseases by water and soil; careful description of skin troubles; of sexual diseases and perversions; of nervous ailments."

"We have reason to believe that when, during the crusades, Europe at last began to establish hospitals, they were inspired by the Arabs of near East. ... The first hospital in Paris, Les Quinze-vingt, was founded by Louis IX after his return from the crusade 1254-1260."

"We find in his (Jabir, Geber) writings remarkably sound views on methods of chemical research, a theory on the geologic formation of metals (the six metals differ essentially because of different proportions of sulphur and mercury in them); preparation of various substances (e.g., basic lead carbonatic, arsenic and antimony from their sulphides)."

Ibn Haytham's writings reveal his fine development of the experimental faculty. His tables of corresponding angles of incidence and refraction of light passing from one medium to another show how closely he had approached discovering the law of constancy of ratio of sines, later attributed to Snell. He accounted correctly for twilight as due to atmospheric refraction, estimating the sun's depression to be 19 degrees below the horizon, at the commencement of the phenomenon in the mornings or at its termination in the evenings."

"A great deal of geographical as well as historical and scientific knowledge is contained in the thirty volume meadows of Gold and Mines of Gems by one of the leading Muslim Historians, the tenth century al Mas'udi. A more strictly geographical work is the dictionary 'Mujam al-Buldan' by al-Hamami (1179-1229). This is a veritable encyclopedia that, in going far beyond the confines of geography, incorporates also a great deal of scientific lore."

"'Abd al-Malik ibn Quraib al-Asmai (739-831) was a pious Arab who wrote some valuable books on human anatomy. Al-Jawaliqi who flourished in the first half of the twelfth century and 'Abd al-Mumin who flourished in the second half of the thirteenth century in Egypt, wrote treatises on horses. The greatest zoologist amongst the Arabs was al-Damiri (1405) of Egypt whose book on animal life, 'Hayat al-Hayawan' has been translated into English by A.S.G. Jayakar (London 1906, 1908)."

"The weight of venerable authority, for example that of Ptolemy, seldom intimidated them. They were always eager to put a theory to tests, and they never tired of experimentation. Though motivated and permeated by the spirit of their religion, they would not allow dogma as interpreted by the orthodox to stand in the way of their scientific research."

In David Lean's great 1962 film, Lawrence of Arabia (empathically portrayed by Peter O'Toole), King Faisal (played by Alec Guiness) says: "In Cordoba the streets had two miles of lighting when London was a village."