The greatest evidences of the high state of civilization which the Sudan had in the fourteenth and fifteenth centuries were the attention that was paid to education and the unusual amount of learning that existed there. The university of Sankore at Timbuctu was a very active center of learning. It was in correspondence with the universities of North Africa and Egypt. It was in touch with the universities of Spain. In the sixteenth century Timbuctu had a large learned class living at ease and busily occupied with the elucidation of intellectual and religious problems. The town swarmed with students. Law, literature, grammar, theology and the natural sciences were studied. The city of Melle had a regular school of science. One distinguished geographer is mentioned, and allusions to surgical science show that the old maxim of the Arabian schools, "He who studies anatomy pleases God," was not forgotten. One of these writers mentions that his brother came from Jenne to Timbuctu to undergo an operation for cataract of the eyes at the hands of a celebrated surgeon there. It is said that the operation was wholly successful. The appearance of comets, so amazing to Europe of the Middle Ages and at the present time to the ignorant, was by these learned blacks noted calmly as a matter of scientific interest. Earthquakes and eclipses excited no great surprise. The renowned writer of the Sudan was Abdurrahman Essadi. He was born in Timbuctu in 1596. He came of learned and distinguished ancestors. He is chief author of the history of Sudan. The book is said to be a wonderful document. The narrative deals mainly with the modern history of the Songhay Empire, and relates the rise of this black civilization through the fifteenth and sixteenth centuries and its decadence up to the middle of the seventeenth century. The noted traveller, Barth, was of the opinion that the book forms one of the most important additions that the present age has made to the history of mankind. The work is especially valuable for the unconscious light which it throws upon the life, manners, politics, and literature of the country. It presents a vivid picture of the character of the men with whom it deals. It is sometimes called the Epic of the Sudan.