VI PREFACE. 



to present the book in the most attractive and perfect 

 manner possible to the mechanics of their profession. 



The illustrations have been carefully selected and 

 their sources credited. Note should also be made of the 

 excellence of the work of the artist, Mr. George A. 

 Newman. 



Finally, the book is not a compilation ; it is the 

 result of years of practical work and a large experi- 

 ence in teaching. The descriptions in the text have 

 been taken from the bone itself and the subject on 

 the table, and are so treated as to adapt them to the 

 student everywhere. 



538 NORTH SIXTH STREET. 

 September, 1891. 



