This work of the late Dr. William Murrell having met with such a large measure of success, the publishers thought it would be well to bring out a new edition, and invited me to revise the last impression.
This I have done, and while retaining Dr. Murrell's text closely, I have made large additions, in order to bring the "Aids" up to present requirements. I have also rearranged the matter with the object of making the various sections more consecutive than they were previously.
