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. IN presenting the following pages to the public, it is from no egotistic belief on our part that our processes are infallibly the best, nor that the tone and perfection of our own practical results are the finest; but we are prompted by altogether different feelings. The motives which have induced us to undertake this labor and work are those which embrace the general good and instruction of all artists.