Carsten Niebuhr was the first to make and bring to Europe an exact and complete copy of inscriptions at Persepolis in an unknown character. Many attempts had been made to explain them, but all had been vain, until in 1802 Grotefend, the learned Hanoverian philologist, succeeded, by an inspiration of genius, in solving the mystery in which they were enveloped. Truly these cuneiform characters were strange and difficult to decipher! Imagine a collection of nails variously arranged, and forming groups horizontally placed. What did these groups signify? Did they represent sounds and articulations, or, like the letters of our alphabet, complete words? Had they the ideographic value of Chinese written characters? What was the language hidden in them? These were the problems to be solved! It appeared probable that the inscriptions brought from Persepolis were written in the language of the ancient Persians, but Rask, Bopp, and Lassen had not yet studied the Iranian idioms and proved their affinity with Sanskrit. It would be beyond our province to give an account of the ingenious deductions, the skilful guesses, and the patient groping through which Grotefend finally achieved the recognition of an alphabetic system of writing, and succeeded in separating from certain groups of words what he believed to be the names of Darius and Xerxes, thus attaining a knowledge of several letters, by means of which he made out other words. It is enough for us to say that the key was found by him, and to others was left the task of completing and perfecting his work. More than thirty years passed by, however, before any notable progress was made in these studies. It was our learned fellow-countryman Eugene Burnouf who gave them a decided impulse. Turning to account his knowledge of Sanskrit and Zend, he found that the language of the inscriptions of Persepolis was but a Zend dialect used in Bactriana, which was still spoken in the sixth century B.C., and in which the books of Zoroaster were written. Burnouf's pamphlet bears date 1836. At the same period Lassen, a German scholar of Bonn, came to the same conclusion on the same grounds. The inscriptions already discovered were soon all deciphered; and with the exception of a few signs, on the meaning of which scholars were not quite agreed, the entire alphabet became known. But the foundations alone were laid; the building was still far from finished. The Persepolitan inscriptions appeared to be repeated in three parallel columns. Might not this be a triple version of the same inscription in the three chief languages of the Achaemenian Empire, namely, the Persian, Median, and Assyrian or Babylonian. This guess proved correct; and owing to the decipherment of one of the inscriptions, a test was obtained, and the same plan was followed as that of Champollion with regard to the Rosetta stone, on which was the tri-lingual inscription in Greek, Demotic or Enchorial, and hieroglyphic characters.