ECOLOGY - Continued 



MOORE, WALTER GUY. Studies on the oxygen requirements of 

 certain fresh-water fishes s . with special reference to winter con- 

 ditions, PhD, Univ, of Minnesota, 19kl- 



MCDOUGALL, KENNETH DOUGALo Sessile invertebrates of Beaufort, 

 North Carolina, A study of settlement, growth and seasonal fluctua- 

 tions among pile-dwelling organisms „ PhD, Duke Univ„ , 19l*2 ■> 



PENNAK, ROBERT W, The ecology of the psammolittoral organisms 

 of some Wisconsin lakes, with special reference to the Tardigrada, 

 Copepoda, and Rotatoria, PhD, Univ„ of Wisconsin, 1938= 



PERLMUTTER, ALFRED „ Variation of American North Atlantic 

 e fishes c 

 Michigan, 19Ul< 



marine fishes correlated with the environment, PhD, Univ, of 



PRATT, HAROLD P a Ecology of the trout of the Gunnison River, 

 PhD, Univ, of Colorado, 1938, 



REIF, CHARLES BRADDOCK. A study of Minnesota stream communi- 

 ties, PhD, Univ, of Minnesota, 19Ul» 



RICKER, WILLIAM Ec Studies of the limnological factors 

 affecting the propagation and survival of the sockeye salmon, 

 Oncorhynchus nerka , at Cultus Lake, British Columbia, PhD, Univ, 

 of Toronto, 193 ° » 



ROELOFS, EUGENE WOODROW, Water soils in relation to lake 

 productivity, PhD, Michigan State College, 19hl° 



ROGERS, HAROLD M, The estuary as a biological habitat, with 

 special reference to the smelt _ a Osmerus mordax (Mitchill), PhD, 

 Univ„ of Toronto, 1939. 



SCOTT, GRACE WINNIFRED WORKMAN, Certain aspects of the 

 behaviour of frog tadpoles and fish with respect to temperature, 

 PhD, Toronto, 19U3 



SHAPIRO, SIDNEY, Geographic variation in Fundulus diaphanus , 

 a Cyprinodontid fish, 137 p. PhD, Michigan, 19W* 



SMITH, GEORGE Fa M, Some factors limiting the distribution 

 and size of the starfish, Asterias vulgaris (Verrill), PhD, Univ, 

 of Toronto, 1939 » 



