APPENDIX 



CHAPTER VI 



THE DEVELOPMENT OF ELECTRIC RAILWAYS 



(pp. 1 79-181). Early experimental railways. The quotation 

 is from the article on " Street and Electric Railways," by Thomas 

 Commerford Martin, in the Special Report of the U. S. Census 

 Office on Street and Electric Railways, Washington, 1905. 



CHAPTER IX 



NAVIGATING THE AIR 



(p. 247). Henson's studies of the flying-machine. The quota- 

 tion is from Travels in Space, by E. Seton Valentine and F. L. 

 Tomlinson, New York, 1902. 



CHAPTER X 



THE TRIUMPH OF THE AEROPLANE 



(p. 275). How the air supports a heavier-than-air mechanism. 

 The quotation is from an article on "The Flying Machine," 

 by Professor S. P. Langley, in McClure*s Magazine for June, 1897. 



(p. 284). Langley's aerodrome. The description is from 

 Professor Langley's own account in McClure^s Magazine, above 

 cited. 



(pp. 289, 290). Experiments of the Wright brothers. The 

 quotation is from an article on "The Wright Brothers' Aeroplane," 

 by Orville and Wilbur Wright, in The Century Magazine for 

 September, 1908. 



(p. 298). Cross-country flight by French officers. The quota- 

 tion is from the Scientific American of June 18, 19 10, This 

 periodical has shown great interest in the new science of aeronau- 

 tics, and was the first to offer a trophy for long-distance flying — 

 a trophy that was won for the years 1908 and 1909 by Mr. 

 Glenn H. Curtiss. The Wright brothers have declined to compete 

 for prizes; otherwise "records" for cross-country flying and the 

 like would doubtless have advanced even more rapidly than 

 has been the case. 



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