LIST OF PLATES 



Secretary's Report : Page 



Plates 1, 2 32 



Astronomy in Shakespeare's time (Abbot) : 



Plates 1-6 122 



Size of the universe (Jeans) : 



Plates 1, 2 128 



Sunspots (Andrews) : 



Plates 1, 2 144 



Northern lights (Eve) : 



Plates 1-5 160 



Cryogenic laboratory at Leiden (Guillien) : 



Plates 1-5 184 



Ocean bottom (Piggot) : 



Plates 1-6 216 



Evolution (Pycraft) : 



Plates 1-6 242 



Gorillas (Pitman) : 



Plates 1-6 276 



Vampire bat (Ditmars and Greeuhall) : 



Plates 1-4 296 



Birds of Ceylon (Wood) : 



Plates 1-9 302 



Wax palms (Bombard) : 



Plates 1^ 324 



Diatoms (Conger) : 



Plates 1-19 344 



Plant virus problem (Smith) : 



Plates 1, 2 352 



Sun rays and plant life (Johnston) : 



Plates 1-4 ^^-_ 372 



Ultraviolet radiation (Meier) : 



Plates 1, 2 382 



Aerial photography (Baisley) : 



Plates 1-13 390 



Easter Island (Lavachery) : 



Plates 1-4 396 



Eskimo archeology (Mathiassen) : 



Plates 1-3 404 



Petroglyphs (Steward) : 



Plates 1-12 426 



History of the crossbow (Wilbur) : 



Plates 1-6 438 



