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The Legacy:
The foundation of this
legacy was the astonishing achievements of Muslim scholars,
scientists, craftsmen, and traders during the two hundred years or
so that are called the Golden Age. During this period, from 750 to
950, the territory of the Muslim Empire encompassed present-day
Iran, Syria, Iraq, Egypt, Palestine, North Africa, Spain, and parts
of Turkey and drew to Baghdad peoples of all those lands in an
unparalleled cross-fertilization of once isolated intellectual
traditions.
Geographical unity,
however, was but one factor. Another was the development of Arabic,
by the ninth century, into the language of international scholarship
as well as the language of the Divine Truth. This was one of the
most significant events in the history of ideas.
A third important
factor was the establishment in Baghdad of a paper mill. The
introduction of paper, replacing parchment and papyrus, was a
pivotal advance which had effects on education and scholarship as
far reaching as the invention of printing in the fifteenth century.
It made it possible to put books within the reach of everyone.
Unlike the
Byzantines, with their suspicion of classical science and
philosophy, the Muslims were enjoined by the Prophet to "seek
learning as far as China" - as, eventually, they did. In the eighth
century, however, they had a more convenient source: the works of
Greek scientists stored in libraries in Constantinople and other
centers of the Byzantine empire. In the ninth century the Caliph al-Mamun,
son of the famous Harun al-Rashid, began to tap that invaluable
source. With the approval of the Byzantine emperor, he dispatched
scholars to select and bring back to Baghdad Greek scientific
manuscripts for translation into Arabic at Bayt al-Hikmah, "the
House of Wisdom."
Bayt al-Hikmah was a
remarkable assemblage of scholar-translators who undertook a
Herculean task: to translate into Arabic all of what had survived of
the philosophical and scientific tradition of the ancient world and
incorporate it into the conceptual framework of Islam.
As the early
scholars in the Islamic world agreed with Aristotle that mathematics
was the basis of all science, the scholars of the House of Wisdom
first focused on mathematics. Ishaq ibn Hunayn and Thabit ibn Qurrah,
for example, prepared a critical edition of Euclid's Elements, while
other scholars translated a commentary on Euclid originally written
by a mathematician and inventor from Egypt, and still others
translated at least eleven major works by Archimedes, including a
treatise on the construction of a water clock. Other translations
included a book On mathematical theory by Nichomachus of Gerasa, and
works by mathematicians like Theodosius of Tripoli, Apollonius
Pergacus, Theon, and Menelaus, all basic to the great age of Islamic
mathematical speculation that followed.
The first great
advance on the inherited mathematical tradition was the introduction
of "Arabic" numerals, which actually originated in India and which
simplified calculation of all sorts and made possible the
development of algebra. Muhammad ibn Musa al-Khwaraznli seems to
have been the first to explore their use systematically, and wrote
the famous Kitab al-Jabr wa-l-Muqabalah, the first book on algebra,
a name derived from the second word in his title. One of the basic
meanings of jabr in Arabic is "bonesetting," and al-Khwarazmi used
it as a graphic description of one of the two operations he uses for
the solution of quadratic equations.
The scholars at Bayt
al-Hikmah also contributed to geometry, a study recommended by Ibn
Khaldun, the great North African historian, because "it enlightens
the intelligence of the man who cultivates it and gives him the
habit of thinking exactly." The men most responsible for encouraging
the study of geometry were the sons of Musa ibn Shakir, al-Mamurl's
court astronomer. Called Banu Musa - "the sons of Musa" - these
three men, Muhammad, Ahmad, and al-Hasan, devoted their lives and
fortunes to the quest for knowledge. They not only sponsored
translations of Greek works, but wrote a series of important
original studies of their own, one bearing the impressive title The
Measurement of the Sphere, Trisection of the Angle, and
Determination of Two Mean Proportionals to Form a Single Division
between Two Given Quantities.
The Banu Musa also
contributed works on celestial mechanics and the atom, helped with
such practical projects as canal construction, and in addition
recruited one of the greatest of the ninth-century scholars, Thabit
ibn Qurrah.
During a trip to
Byzantium in search of manuscripts, Muhammad ibn Musa happened to
meet Thabit ibn Qurrah, then a money changer but also a scholar in
Syriac, Greek, and Arabic. Impressed by Thabit's learning, Muhammad
personally presented him to the caliph, who was in turn so impressed
that he appointed Thabit court astrologer. As Thabit's knowledge of
Greek and Syriac was unrivaled, he contributed enormously to the
translation of Greek scientific writing and also produced some
seventy original works - in mathematics, astronomy, astrology,
ethics, mechanics, music, medicine, physics, philosophy, and the
construction of scientific instruments.
Although the House
of Wisdom originally concentrated on mathematics, it did not exclude
other subjects. One of its most famous scholars was Hunayn ibn
Ishaq, Ishaq's father - known to the West as Joanitius - who
eventually translated the entire canon of Greek medical works into
Arabic, including the Hippocratic oath. Later a director of the
House of Wisdom, Hunayn also wrote at least twenty-nine original
treatises of his own on medical topics, and a collection of ten
essays on ophthalmology which covered, in systematic fashion, the
anatomy and physiology of the eye and the treatment of various
diseases which afflict vision. The first known medical work to
include anatomical drawings, the book was translated into Latin and
for centuries was the authoritative treatment of the subject in both
Western and Eastern universities.
Others prominent in
Islamic medicine were Yuhanna ibn Masawayh, a specialist in
gynecology and the famous Abu Bakr Muhammad ibn Zakariya al-Razi -
known to the West as Rhazes. According to a bibliography of his
writings al-Razi wrote 184 works, including a huge compendium of his
experiments, observations, and diagnoses with the title al-Hawi,
"The All-Encompassing."
A fountainhead of
medical wisdom during the Islamic era, al-Razi, according to one
contemporary account, was also a fine teacher and a compassionate
physician, who brought rations to the poor and provided nursing for
them. He was also a man devoted to common sense, as the titles of
two of his works suggest. The Reason Why Some Persons and the Common
People Leave a Physician Even If He Is Clever, and A Clever
Physician Does Not Have the Power to Heal All Diseases, for That is
Not within the Realm of Possibility.
The scholars at the
House of Wisdom, unlike their modern counterparts, did not
"specialize." Al-Razi, for example, was a philosopher and a
mathematician as well as a physician and al-Kindi, the first Muslim
philosopher to use Aristotelian logic to support Islamic dogma, also
wrote on logic, philosophy, geometry, calculation, arithmetic,
music, and astronomy. Among his works were such titles as An
Introduction to the Art of Music, The Reason Why Rain Rarely Falls
in Certain Places, The Cause of Vertigo, and Crossbreeding the Dove.
Another major figure
in the Islamic Golden Age was al-Farabi, who wrestled with many of
the same philosophical problems as al-Kindi and wrote The Perfect
City, which illustrates to what degree Islam had assimilated Greek
ideas and then impressed them with its own indelible stamp. This
work proposed that the ideal city be founded on moral and religious
principles from which would flow the physical infrastructure. The
Muslim legacy included advances in technology too. Ibn al-Haytham,
for example, wrote The Book of Optics, in which he gives a detailed
treatment of the anatomy of the eye, correctly deducing that the eye
receives light from the object perceived and laying the foundation
for modern photography. In the tenth century he proposed a plan to
dam the Nile. It was by no means theoretical speculation; many of
the dams, reservoirs, and aqueducts constructed at this time
throughout the Islamic world still survive.
At Hama in
Syria, antique wooden
wheels still
lift the waters of the Orontes
to gardens,
baths, and cooling fountains.
Muslim engineers
also perfected the waterwheel and constructed elaborate underground
water channels called qanats. Requiring a high degree of engineering
skill, qanats were built some fifty feet underground with a very
slight inclination over long distances to tap underground water and
were provided with manholes so that they could be cleaned and
repaired.
Agricultural
advances are also part of the Muslim legacy. Important books were
written on soil analysis, water, and what kinds of crops were suited
to what soil. Because there was considerable interest in new
varieties - for nutritive and medicinal purposes - many new plants
were introduced: sorghum, for example, which had recently been
discovered in Africa.
The introduction of
numerous varieties of fruits and vegetables and other plants to the
West via the Islamic empire was, however, largely the result of the
vast expansion of trade during the Golden Age. This trade was vital;
in the central lands of the 'Abbasid empire natural resources such
as metals and wood were scarce, and increases in urban populations
had outstripped the capacity of the agricultural system to support
them. The 'Abbasids, therefore, were forced to develop extensive and
complicated patterns of trade. To obtain food, for example, Baghdad
had to import wheat from Syria and Egypt, rice from the Fayyum in
Egypt, southern Morocco, and Spain, and olive oil from Tunisia.
Called "a forest of olive trees," Tunisia exported so much olive oil
that its port of Sfax was called "the port of oil."
To obtain scarce
metals the 'Abbasids had to turn elsewhere. They imported the
technologically advanced "ondanique" steel from India, for example,
and then processed it at such famous centers of weapons manufacture
as Damascus and Toledo, both of which cities won fame for their
blades. The 'Abbasids also imported iron from Europe, tin from the
British Isles and Malaya, and silver from northern Iran,
Afghanistan, and the Caucuses. For gold, once the vast quantities in
the treasuries of the conquered countries were exhausted, they
turned to several sources. One was the gold mines of the Hijaz which
were reopened around 750, reworked for about four hundred years, and
then, in 1931, explored again by Karl Twitchell, who was searching
for minerals in that area on behalf of King 'Abd al-'Aziz of Saudi
Arabia.
For these
necessities the 'Abbasid traders exchanged a wide variety of
products: pearls, livestock, paper, sugar, and (a specialty of the
Islamic world) luxurious cloth. The traditional cloths were wool and
linen - the latter an Egyptian specialty since ancient times - but
cotton, which was introduced into upper Iraq about the time of the
Prophet, later spread with Islam around the Mediterranean, to Syria,
North Africa, Spain, Sicily, Cyprus, and Crete.
The cloth trade
produced a number of auxiliary exports: gold and silver thread for
embroidery, gum from the Sudan for glazing, and needles, looms, and
dyestuffs. Closely connected with the trade in dyestuffs was the
trade in medicines, an offshoot of 'Abbasid advances in medicine and
the spread of hospitals in all major Islamic cities. As scientific
research and translation of medical texts from India and possibly
even China expanded the earlier pharmacopoeia, ingredients for
medicines were brought from all over the known world and also
reexported.
Because the
religious, political, and military achievements of the Islamic
period loom so large in the history of the world, the extraordinary
cultural, scientific, technological, and commercial achievements are
frequently obscured or overlooked. Yet these advances were, in fact,
of enduring significance to mankind as a whole. The destruction by
the Mongols of many of these achievements and of much of what the
Muslims had accomplished by the end of the Golden Age was a tragic
loss for the world as a whole.
Architectural
monuments spanning a thousand years bear witness to the spread of
Islam.
Jerusalem's
Dome of the Rock, built in 691-692.
Purity of line
characterizes the late
twelfth
century Kutubiyah Mosque
of the Berbers
in Marrakesh.
Water courses
and fountains make an oasis of the Alhambra
palace built
at Granada in the fourteenth century Here i
ncredibly
light and elegant elements of
Islamic
decoration find their highest realization.
Sixteenth
century Sultan Selim Mosque at Edirne
is the apogee
of Ottoman Turkish architecture,
soaring space
enclosed with a massive dome.
Persia's
greatest contribution to ornament,
gloriously
colored enameled tile, faces the dome
and stalactite
portal of Shaykh Lutf Allah Mosque,
built in the
early 1600s on Isfahan's vast royal plaza.
The peak of
Mogul architecture and possibly
the most
famous work of all times and cultures
is the
dazzling Taj Mahal mausoleum built at Agra in 1629.

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