vi Introduction 



trations and other details of the book. Though this lamented 

 event has delayed its appearance, I have been enabled to secure 

 the aid of valued assistants who have carried the work through. 

 I have added to the original plan a biographical sketch of 

 Doctor Goode, by Doctor David Starr Jordan, President of the 

 Leland Stanford Junior University. 



S. P. LANGLEY, 



Secretary. 

 Smithsonian Institution, 



Washington, June 23, 1897. 



