It is not comprised of quack theories or foolish ideas, and is*not written by a college student, who knows nothing except what he has been told or gathered up from papers and periodicals. ~but is written by a thor ough expert mechanic who has spent the best part of his life over the anvil with the hammer and tongs and 'making tools of every description, from steel of every quality and temper and almost every brand or make, and the contents of this book are the results of hard work, deep study, years of experimenting and'wide travel. The information given is of a simple, practical, and scientific nature, which can be easily understood and everything accomplished by a mechanic of average intelligence.