In autumn 1558, Calvin became ill with a fever. He was afraid he might die before finishing his last revision of the "Institutes". Because of this, he forced himself to work. The last edition became much longer, so Calvin called it a new work. It was 21 chapters in the edition before the last one. However, in the last one, it was 80. This was because of more detail in the material that was already there: more subjects were not really added. Soon after he became better, he strained his voice while preaching. This made him cough violently. He burst a blood-vessel in his lungs. His health became much worse after this. He preached his last sermon in St. Pierre on February 6, 1564. On April 25, he made his will. In his will, he left a little money to his family and to the "collège". A few days later, the ministers of the church came to visit him. He died of septicaemia. This goodbye is recorded in "Discours d'adieu aux ministres". He remembered his life in Geneva. Calvin died on May 27, 1564. He was 54. On the next day, he was buried in an unmarked grave in the Cimetière de Plainpalais. People are not sure where the grave is exactly. However, a stone was added in the 19th century to mark a grave traditionally thought to be Calvin's.