To those acquainted with Botany it is well known that many changes have taken place in the nomenclature of plants since the late Dr. Roxburgh added the final touch to his manuscripts. In many instances whole orders have undergone a complete revision; genera have been frequently divided into two or three; specific names have been changed; and plants have been removed from one genus to another. The Editor however thought it best to publish his late friends manuscript in the state in which he left it; and to add in notes such alterations as have been made by botanists with whose improvements the author was unacquainted or who have written since his death. The whole work therefore corresponds exactly with Dr. Roxburghs manuscript after it had received his last correction with the exceptions just mentioned and of such corrections of the language as were necessary which in no instance have been suffered to make any alteration in the sense. It is intended to terminate the work with an additional volume which shall include all the plants which may be discovered during the progress of it through the press.