vi PREFACE 



and in order to lead to reading in other books which give more 

 details. 



The author wishes to express his appreciation to the class 

 of 1917 of the George Westinghouse High School for the 

 inspiration received from them to start this book; to Misses 

 C. E. Kim and Elizabeth Collett for suggestions in English; 

 to his wife and others for reading the proof; to the United 

 States Department of Agriculture, the Westinghouse Motor 

 Company, LaFlam Milk Co., and Mr. Roe for photographs 

 to illustrate the work. 



