The well-known writer George Sarton says in his Introduction to the History of Science that "Rhazes was the greatest physician of Islam and the Medieval Ages." And the Encyclopedia of Islam remarks that "Rhazes remained up to the 17th century the indisputable authority of medicine." The Bulletin of the World Health Organization (WHO), May 1970, pays tribute to him by stating: "His writings on smallpox and measles show originality and accuracy, and his essay on infectious …showed first 75 words of 2356 total…

…showed last 75 words of 2356 total…of Clinical Medicine" P. 30, 35 (2) ibid. P 25 (3) Al-Samarai, K "Who is Abu Bakr Al-Razi?", P. 19 (4) Ibn Abi Usaibi'ah, op.cit. P. 732 (5) Olman, M., Islamic Medicine., Arabic Translation by Y. Al-Kilani, Kuwait, P.125 (6) Ibid. P. 126 (7) Galal, M., The Arab Methodology of Scientific Research in Natural and Cosmological Sciences, The Lebanese Publishing House, Beirut, 1972, P. 128. (8) Max Mayerhof, "Science and Medicine", in The Legacy of Islam by T. Arnold, The Arabic translation by Gorgeis Fathallah, Dar al-Taleia, Beirut, 1972, P.423.