DISPERSAL AND SURVIVAL OF PLANTS 205 



Ridley, H. N. (1930). The Dispersal of Plants throughout the World. L. Reeve & Co. Ltd., 



Ashford, England. 

 RoNNiNG, O. I. (1959). The vascular flora of Bear Island. Acta Borealia A. Scientia 15, 1-53. 

 Salisbury, E. J. (1942). The Reproductive Capacity of Plants. G. Bell, London. 

 Samuelsson, G. (1934). Die Verbreitung der hoheren Wasserpflanzen in Nord-Europa. 



Acta Phytogeogr. Suec. 6, 1-211. 

 Savile, D. B. O. (1961). The Botany of the Northwestern Queen Elizabeth Islands. Canad. 



J. Bot. 39, 909-942. 

 ScHAANiNG, H. L. T. (1933a). A contribution to the bird fauna of East-Greenland. Norges 



Svalbard og Ishavsundersokelser. Skr. Svalbard of Ishavet 49, 25-39. 

 SCHOLANDER, P. F. (1934). Vascular plants from northern Svalbard. Norges Svalbard og 



Ishavsundersokelser. Skr. Svalbard og Ishavet 62, 1-153. 

 Sladen, W. J. (1960). The flora of a breeding area of pink-footed geese in central Iceland. 



Proc. Linn. Soc. London 171, 30-52. 

 SoRENSEN, T. (1933). The vascular plants of East Greenland from 71^ to 73° 30' N. Lat. 



Medd. om Groenl. 101(3), 1-177. 

 SvERDRUP, H. (1957). The stress of the wind on the ice of the polar sea. Norsk Polarinstitutt 



Skrifter 111, 1-11. 

 Swan, L. W. (1961). The ecology of the High Himalayas. Scientific American 205, 68-90. 

 TiKHOMiROV, B. A. (1951). Ontheroleof the wind in the plant distribution in the Far North 



(in Russian). Priroda 1951 23-25. 

 TiKHOMiROV, B. A., Shamurin, V. F., and Shtepa, V. S. (1960). Temperature of Arctic 



plants (in Russian). Isvestiya Akademii Nauk SSSR, Ser. Biol. 3, 429-442. 

 WiTHERBY, H. F., Jourdain, F. C. R., Ticehurst, N. F., and Tucker, B. W. (1939). The 



Handbook of British Birds. H. F. and C. Witherby, London. 

 YocoM, C. F. (1947). Observations on bird life in the Pacific Ocean off the North American 



shores. Condor 49, 204-208. 



