To the Student who uses this TexthooX: 



This textbook represents many years of 

 learning and experience on the part of the 

 author. It does not treat of an ephemeral 

 subject, but one which, since you are study- 

 ing it in college, you must feel will have a 

 use to you in your future life. 



Unquestionably you will many times in 

 later life wish to refer to specific details 

 and facts about the subject which this book 

 covers and which you may forget. How 

 better could you find this information than 

 in the textbook which you have studied from 

 cover to cover? 



Retain it for your reference library. You 

 will use it many times in the future. 



The Puhlishers. 



