LIMNOLOGY - Continued 



GALLER, SIDNEY R. A limnological investigation of acid ponds with 

 particular reference to the factors influencing the distribution and 

 abundance of the phytoplankton. PhD, UniVo of Maryland, 19U8. 



GARCIA -DIAZ, JULIO. An ecological survey of the fresh water 

 insects of Puerto Rico. I. The Odonata: with new life -histories. 

 PhD, Cornell, 1937 . 



GREENBANK, JOHN THOMAS „ Limnological conditions in ice-covered 

 lakes, especially as related to winter-kill of fish. PhD, Univ. of 

 Michigan, 19UU- 



HARPSTER, HILDA T„ An investigation of the gaseous plastron 

 as a respiratory mechanism in certain adult aquatic Coleoptera. 

 PhD, Michigan, 1939- 



HARRIS, JOSEPH POLLARD,, Mechanical effects of water turbulence 

 on certain fresh-water plankters . PhD, Michigan, 19U2. 



HATCHETT, STEPHEN PINCKNEY, Biology of the Isopoda of Michigan. 

 PhD, Michigan, 19U3- 



HIRST, JOHN MENDEL o A limnological survey of the streams of the 

 East Tionesta Tract, Allegheny National Forest, McKean and Warren 

 Counties, Pennsylvania, PhD, Univ. of Pittsburgh, 19U1. 



HOFFMAN, CARL E„ A limnological investigation of some northern 

 Michigan Donaciini (Chrysomelidaes Coleoptera). PhD, Michigan, 1938. 



HOOPER, FRANK F The summer standing crop of a small Minnesota 

 lake. PhD, Univ. of Minnesota, 19l±8. 



HUGHES, ELWYN OWEN Freshwater algae of the maritime provinces. 

 PhD, Ohio, 19U3. 



IDE, F» Po The effect of temperature on the distribution of the 

 Mayfly (Ephemeroptera) fauna of a stream. Post embryological develop- 

 ment of Ephemeroptera (Mayflies) external characters only. PhD, 

 Toronto, 193k ° 



IRWIN, WILLIAM HENRY o The Culicinae of certain northern Michigan 

 bog mats with special reference to the limnological dynamics influencing 

 their production. PhD, Michigan, 19U0. 



JAO, CHIN-CHIHo Studies on the freshwater algae of China. PhD, 

 Michigan, 1935 . 



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