

ADVERTISEMENT 



The present work, " Bibliography of Aeronautics," forms Volume 55 

 of the " Smithsonian Miscellaneous Collections." This series is intended 

 to embrace all the publications issued directly by the Smithsonian Insti- 

 tution in octavo form ; those in quarto constituting the " Smithsonian 

 Contributions to Knowledge." The quarto series includes memoirs, em- 

 bracing the records of extended original investigations and researches, 

 resulting in what are believed to be new truths, and constituting positive 

 additions to the sum of human knowledge. The octavo series is designed 

 to contain reports on the present state of our knowledge of particular 

 branches of science; instructions for collecting and digesting facts and 

 materials for research; lists and synopses of species of the organic and 

 inorganic world; reports of explorations; aids to bibliogi*aphical investi- 

 gations, etc., generally prepared at the express request of the Institution, 

 and at its expense. 



In the Smitlisonian Contributions to Knowledge, as well as in the 

 present series, each article is vSeparately paged. The actual date of its 

 publication is that given on its special title-page, and not that of the 

 volume in which it is placed. In many cases works have been pub- 

 lished and largely distributed, years before their combination into 

 volumes. 



Charles D. Walcott, 

 Secretary of the Smithsonian Institution 



Washington, April, 1910 



(iii) 



