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. Course by writing out the remainder from my notes. The last six will, on this account perhaps, be found less conversational and familiar; but, I hope, not less instructive. These attempts at popular instruction have been produced at a very low price, in the hope that they may contribute in some measure to advance the study of those laws by which life and health are secured, and without a knowledge of which man can never realize the highest objects of his existence.