History of Human Society

by Frank W. Blackmar

The Beginnings of Chemistry and Medicine.—In chemistry the careful study of the elements of substances and the agents in composition was pursued by the Arab-Moors in Spain, but it must be remembered that the chemistry of their day is now known as alchemy. Chemistry then was in its formative period and not a science as viewed in the modern sense. Yet when we consider that the science of modern chemistry is but a little over a century old, we find the achievements of the Arabians in their own time, as compared with the changes which took place in the following seven centuries, to be worthy of note.

In the eleventh century a philosopher named Geber knew the chemical affinities of quicksilver, tin, lead, copper, iron, gold, and silver, and to each one was given a name of the planet which was supposed to have special influence over it. Thus silver was named for the moon, gold for the sun, copper for Venus, tin for Jupiter, iron for Vulcan, quicksilver for Mercury, and lead for Saturn. The influences of the elements were supposed to be similar to the influence of the heavenly bodies over men. This same chemist was acquainted with oxidizing and calcining processes, and knew methods of obtaining soda and potash salts, and the properties of saltpetre. Also nitric acid was obtained from the nitrate of potassium. These and other similar examples represent something of the achievements of the Arabians in chemical knowledge. Still, their lack of knowledge is shown in their continued search for the philosopher's stone and the attempt to create the precious metals.

The art of medicine was practised to a large extent in the Orient, and this knowledge was transferred to Spain. The entire knowledge of these early physicians, however, was limited to the superficial diagnosis of cases and to a knowledge of medicinal plants. By the very law of their religion, anatomy was forbidden to them, and, indeed, the Arabians had a superstitious horror of dissection. By ignorance of anatomy their practice of surgery was very imperfect. But their physicians, nevertheless, became renowned throughout the world by their use of medicines and by their wonderful cures. They plainly led the world in the art of healing. It is true their superstition and their astrology constantly interfered with their better judgment in many things, but notwithstanding these drawbacks they were enabled to develop great interest in the study of medicine and to accomplish a great work in the advancement of the science. In Al Makkari it is stated "that disease could be more effectively checked by diet than by medicine, and that when medicine became necessary, simples were far preferable to compound medicaments, and when these latter were required, as few drugs as possible ought to enter into their composition." This exhibits the thoughtful reflection that was given to the administration of drugs in this early period, and might prove a lesson to many a modern physician.

Toward the close of their career, the Arabian doctors began the practice of dissecting and the closer study of anatomy and physiology, which added much to the power of the science. Yet they still believed in the "elixir of life," and tried to work miracle cures, which in many respects may have been successful. It is a question whether they went any farther into the practice of miracle cures than the quacks and charlatans and faith doctors of modern times have gone. The influence of their study of medicine was seen in the great universities, and especially in the foundation of the University at Salerno at a later time, which was largely under the Arabian influence.

Metaphysics and Exact Science.—It would seem that the Arab-Moors were well calculated to develop psychological science. Their minds seemed to be in a special measure metaphysical. They laid the foundation of their metaphysical speculations on the philosophy of the Greeks, particularly that of Aristotle, but later they attempted to develop originality, although they succeeded in doing little more, as a rule, than borrowing from others. In the early period of Arabian development the Koran stood in the way of any advancement in philosophy. It was only at intervals that philosophy could gain any advancement. Indeed, the philosophers were driven away from their homes, but they carried with them many followers into a larger field. The long list of philosophers who, after the manner of the Greeks, each attempted to develop his own separate system, might be mentioned, showing the zeal with which they carried on inquiry into metaphysical science. As may be supposed, they added little to the sum of human knowledge, but developed a degree of culture by their philosophical speculations.

But it is in the exact sciences that the Arabs seem to have met with the greatest success. The Arabic numerals, probably brought from India to Bagdad, led to a new and larger use of arithmetic. The decimal system and the art of figures were introduced into Spain in the ninth century, and gave great advancement in learning. But, strange to relate, these numerals, though used so early by the Arabs in Spain, were not common in Germany until the fifteenth century. The importance of their use cannot be overestimated, for by means of them the Arabians easily led the world in astronomy, mechanics, and mathematics.

The science of algebra is generally attributed to the Arabians. Its name is derived from gabara, to bind parts together, and yet the origin of this science is not certain. It is thought that the Arabs derived their knowledge from the Greeks, but in all probability algebra had its first origin among the philosophers of India.

The Arabians used geometry, although they added little to its advancement. Geometry had reached at this period an advanced stage of progress in the problems of Euclid. It was to the honor of the Arabians that they were the first of any of the Western peoples to translate Euclid and use it, for it was not until the sixteenth century that it was freely translated into the modern languages.

But in trigonometry the Arabians, by the introduction of the use of the sine, or half-chord, of the double arc in the place of the arc itself, made great advancement, especially in the calculations of surveying and astronomy. In the universities and colleges of Spain under Arabian dominion we find, then, that students had an opportunity of mastering nearly all of the useful elementary mathematics. Great attention was paid to the study of astronomy. Here, as before, they used the Greek knowledge, but they advanced the study of the science greatly by the introduction of instruments, such as those for measuring time by the movement of the pendulum and the measurement of the heavenly bodies by the astrolabe.

Likewise they employed the word "azimuth" and many other terms which show a more definite knowledge of the relation of the heavenly bodies. They were enabled, also, to measure approximately a degree of latitude. They knew that the earth was of spheroid form. But we find astrology accompanying all this knowledge of astronomy. While the exact knowledge of the heavenly bodies had been developed to a certain degree, the science of star influence, or astrology, was cultivated to a still greater extent. Thus they sought to show the control of mind forces on earth, and, indeed, of all natural forces by the heavenly bodies. This placed mystical lore in the front rank of their philosophical speculations.