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.