The Arabic Alphabet has 28 letters. The shape of these letters changes depending on their position in the word, whether isolated; in the beginning of the word (initial); in the middle (medial); or at the end (final). http://www.sakkal.com/Arab_Calligraphy_Art1.html
Learning Arabic in England Robert Wakefield who became the Professor of Hebrew at Oxford in 1540 gave a lecture in 1524, which he delivered in Cambridge where he supports to value of Arabic, primarily for biblical studies – asserting that the Book of Job was virtually written in Arabic. In 1555 Richard Argentine a physician delivered a speech advocating the teaching of Arabic at both Oxford and Cambridge. He stressed the benefit of learning Arabic for those practising medicine.