Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. There are several statements in the Introduction to the pre sent treatise, of much importance to all who are familiar with the writings of Dr. Faber, or may hereafter become so. We invite the reader's attention to them; and also to the analysis of this treatise, which stands to the author's other works in the relation of source and origin.