ANNUAL REPORTS, SMITHSONIAN INSTITUTION 



Africa — Continued 

 Stanley and the map of Africa, by J. 



Scott Keltic 1890: 277-291 

 Through Africa from Cape to Cairo, 

 by Ewart S. Grogan. 1900: 431-448 

 See also names of countries 

 Agassiz, Alexander, Gulf stream. 1891: 



189-206 

 Agassiz, Alexander 



Alexander Agassiz, 1835-1910, by Al- 

 fred Goldsborough Mayer. 19 10: 

 447-472 

 Agassiz, Louis Jean Rodolphe 

 Louis Agassiz, by Rufus P. Stebbins. 



1873: 198-210 

 Louis Agassiz: a biographical notice, 

 by Ernest Favre. 1878: 236-261 

 Age 

 Old age, by Elie Metchnikoff. 1904: 



533-550 



Age determination 



Carbon-14 method of age determina- 

 tion, by Frank H. H. Roberts, Jr. 



195 i: 335-350 



Agnew, Samuel A., Mounds in Missis- 

 sippi. 1867: 404-406 

 Agriculture 



Debt of agriculture to tropical Amer- 

 ica, by O. F. Cook. 193 1: 491-501 



Foot-plow agriculture in Peru, by O. F. 

 Cook. 1918: 487-491 



Grassland and farmland as factors in 

 the cyclical development of Eura- 

 sian history, by J. Russell Smith. 



J 944= 357-384 



Milpa agriculture, a primitive tropical 

 system, by O. F. Cook. 1919: 307- 

 326 



See also Farms 

 Air 



Outdoor aerobiology, by P. H. Greg- 

 ory. 1961: 445-453 



Relations of air and water to tempera- 

 ture and life, by Gardiner G. Hub- 

 bard. 1893: 265-275 



See also Atmosphere 

 Air currents 



Holes in the air, by W. J. Humphreys. 

 1912: 257-268 



Jet streams, by R. Lee. 1957: 293-302 

 Nature of currents of air, by A. Cold- 



ing. 1877: 447-462 

 Airplanes 



Aerial locomotion, by F. H. Wenham. 



1889: 303-323 

 Comparison of propeller and reaction 



propelled airplane performances, by 



Benson Hamlin and F. Spenceley. 



1947: 429-457 

 Experiments with the Langley aero- 

 drome, by Samuel Pierpont Langley. 



1904: 1 13-125 

 First man-carrying aeroplane capable 



of sustained free flight — Langley's 



success as a pioneer in aviation, by A. 



F. Zahm. 1914:21 7-222 

 Langley aerodrome. 1900: 197-216 

 19 14 tests of the Langley "aerodrome," 



by C. G. Abbot. 1942: 111-118 

 Stability of aeroplanes, by Orville 



Wright. 1914: 209-216 

 See also Aeronautics, Aviation, 



Dirigibles, Flight 

 Air pollution 

 Air of the New York subway prior to 



1906, by George A. Soper. 1907: 



647-667 

 Atmospheric pollution in growing 



communities, by Francois N. Fren- 



kiel. 1956: 269-299 

 Problems in smoke, fume, and dust 



abatement, by F. G. Cottrell. 1913: 



653-685 

 Air ships, see Dirigibles, Balloons 

 Air transport 



Modern trends in air transport, by 



W. F. Durand. 1939: 513-532 

 Wings for transportation (recent de- 

 velopments in air transportation 



equipment), by Theodore R. 



Wright. 194 1 : 563-583 

 Aitken, John, Phenomena connected 



with cloudy condensation. 1893: 



201-230 

 Alabama 



Mica beds in Alabama, by William 



Gesner. 1879: 382 



