114 THE LIFE OF DEVILS LAKE 



1912 Simpson, H. E. Physiography of the Devils-Stump Lake Re- 

 gion, North Dakota. N. D. Geol. Survey, 6th Bien. Rep. pp. 



105-57. 

 1910 Steuer, A. Planktonkunde. Teubner, Leipzig and Berlin. 

 1918-1920 Thienemann, A. Untersuchungeu iiber die Beziehungen 



zwischeii dem Sauerstoffgehalt des Wassers und der Zusam- 



mensetzung der Fauna in norddeutschen Seen. Archiv fUr 



Hydrobiol., Vol. XII, pp. 1-65. 

 1896 Upham, W. Glacial Lake Agassiz. Monograph of the U. S. 



Geol. Survey, Vol. XXV. 

 1896 Van Heurck, H. A treatise on the Diatomaceae. (tr. Baxter) 



London. 

 1918 Ward, H. B. & Whipple, G. C. F^esh Water Biology. Wiley, 



New York. 

 1904 & 1908 Wesenberg, Lund C. Studier over de danske Soers 



Plankton. Dansk ferskvands-Biologisk Laboratorium Kjoben- 



havn, Nordisk Forlag (2 Vol.) 

 1914 Whipple, G. C. Microscopy of drinking water. Wiley, New 



York. 

 1900 Whipple, G. C. & Jackson, D. D. A comparative study of the 



methods used for the measurement of the turbidity of water. 



Technology Quarterly, Vol. XIII, pp. 274-94. 

 1921 Willard, D. E. Story of the Prairies. 9th Ed. Kalamazoo, 



Mich. 

 1923 (a) Willey, A. Notes on the distribution of free-living Cope- 



poda in Canadian waters. Contrib. to Can. Biol. No. 16. 

 1923 (b) Ecology and the partition of biology. Trans. 



Roy. Soc. Can. Vol. XVII, pp. 1-9. 

 1923 Wood, N. A. A preliminary survey of the bird life of North 



Dakota. Univ. of Mich. Mus. Zool., Misc. Pub., No. 10, pp. 96. 

 1912 Young, R. T. Cryptobranchus alleghaniensis, ... in 



North Dakota. Science, N. S. Vol. XXXV, pp. 308-309. 

 1923 Resistance of fish to salts and alkalinity. Am. 



Jour. Phys., Vol. LXIII, pp. 373-88. 



