20 SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE VOL. 27 



The final results, then, of the observations with rubber-driven models (which 

 were commenced as early as L887, continued actively through the greater por- 

 tion of the year IS'.)] and resumed, as will be seen later, even as late as 1895), 

 were nol such as to give information proportioned to their trouble and cost, and 

 it was decided to commence experiments with a steam-driven aerodrome on a 

 la rue scale. 



