564 PEHR OLSSON-SEFFER 



Cholnoky, I. "Die Bev/egungsgesetze des Flugsandes, " Foldt. Kozl. Budapest, 



Vol. XXXII, 1902, pp. 6-38. 

 Cornish, Vaughan. "On the Formation of Sand-Dunes," Geogr.Joiirn., Vol. 



IX, 1897, pp. 278-302. 

 "On Desert Sand-Dunes Bordering the Nile Delta, Geogr. Journ., Vol. XV, 



1900, pp. 1-30. 

 Darwin, G. H. "On the Horizontal Thrust of a Mass of Sand," Min. Proc. 



Inst. C. E., Vol. LI, 1883, pp. 350-78. 

 Doss, Bruno. "Ueber Diinen der Umgegend von Riga," Korr. Natf. Ver. 



Riga, Vol. XXXIX, 1896, pp. 31-40. 

 Helmholz, H. von. "Die Energie der Wogen und des Windes," Sitz. ber. Ak. 



Wiss. Berlin, Vol. II, 1890, pp. 853-72. 

 Keller. "Studien uber die Gestaltung der Sandkiisten," Zs. Bauwesen, Vol. 



XXXI, 1881, pp. 190-. 

 Labax. "Les dunes maritimes et les sables litteraux," Bull. Soc. geol. France 



(3), Vol. XVIII, 1889-90, pp. 259-73. 

 Langley, S. p. "The Internal Work of the Wind," Am. Journ. Sci., 3d ser., 



Vol XLVII, 1894, pp. 41-63. 

 LoRiE, J. "Binnenduinen en bodenbewegingen, " Tijdschr. aardr. genootsch., 



i893> P- 753- 

 Merrill, G. P., "Wind as a Factor in Geology," Engin. Mag., Vol. II, 1896, 



pp. 596-607. 

 Reclus, Elise. "Etude sur les dunes," Bull. Soc. geog. France (5), Vol. IX, 



1865, pp. 193-. 

 Sauer, a. and Siegert, Th. "Ueber Ablagerung recenten Losses durch den 



Wind," Zs. d. geol. Ges., Vol. XI, 1888, pp. 575- 

 Shaler, N. S. "Phenomena of Beach and Dune Sands," Bull. Geol. Soc. 



■ Amer., Vol. V, 1894, pp. 207-12. 

 Sokoloff, N. a. Die Diinen. Bildung, Entwickelung und innerer Ban, Berlin, 



1894. 

 Steenstrup, K. J. V. "Om Klitternes Vandring," Nath. Medd. Kjohenhavn, 



1894. 

 Thesleff, Arthxtr. "Dynbildningar i Oestra Finland," Medd. Geogr. For. 



Finl, Vol. II, 1895, pp. 36-77. 

 Walther, Johannes. "Ueber die geologische Thatigkeit des Windes," Natw. 



Wochenschr. Berlin, Vol. XVI, 1901, pp. 431-32. 



