The book, An Introductory Lecture Delivered Before The Institute Of Arts And Sciences, Pittsburgh, On The 20Th December, 1836, has been considered by academicians and scholars of great significance and value to literature. This forms a part of the knowledge base for future generations. So that the book is never forgotten we have represented this book in a print format as the same form as it was originally first published. Hence any marks or annotations seen are left intentionally to preserve its true nature.