LIST OF PLATES 



Secretary's Report: Page 



Plates 1, 2 44 



Nebulae (Hubble): 



Plate 1 148 



The sun and the atmosphere (Stetson) : 



Plates 1-3 174 



Nuclear physics (DuBridge) : 



Plates 1, 2 240 



Ice ages (Simpson) : 



Plate 1 298 



Soil erosion (Hall) : 



Plates 1, 2 316 



Eyes that shine at night (Walker) : 



Plate 1 (color) 354 



Mitten crab (Panning): 



Plates 1-9 376 



Black widow spider (D' Amour et al.): 



Plates 1-5 422 



Forest genetics (Austin): 



Plates 1-3 440 



Growing plants without soil (Hoagland and Arnon): 



Plates 1-7 488 



Root-pressure (White): 



Plate 1 498 



Valley of Mexico (Vaillant): 



Plates 1-13 530 



Folsom problem (Roberts): 



Plates 1-15 546 



Roman Orient (Seligman): 



Plates 1-4 568 



Ancient Chinese capital (Bishop) : 



Plates 1-4 578 



Limits to human flight (Wimperis): 



Plate 1_ 594 



American Merchant Marine Survey (Taylor): 



Plates 1-11 600 



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