. Bulletin. Natural history; Natural history. J 92 Illinois Natural History Survey Bulletin Vol. 27, Art. 2 law from 1909 to 1911, became a wide- spread practice in the 1920's, and was prohibited bv federal rej^ulation in 1935 (Bellrose 1944:333). Finally, in recognition of the import- ance of waterfowl problems in Illinois, the Natural History Survey employed Arthur S. Hawkins and Frank C. Bell- rose to initiate a waterfowl research pro- gram in 1938. Up to that time, the study feet of baiting and live decoys on water- fowl and "estimated that 6,000,000 bushels of corn were fed by Illino
. Bulletin. Natural history; Natural history. J 92 Illinois Natural History Survey Bulletin Vol. 27, Art. 2 law from 1909 to 1911, became a wide- spread practice in the 1920's, and was prohibited bv federal rej^ulation in 1935 (Bellrose 1944:333). Finally, in recognition of the import- ance of waterfowl problems in Illinois, the Natural History Survey employed Arthur S. Hawkins and Frank C. Bell- rose to initiate a waterfowl research pro- gram in 1938. Up to that time, the study feet of baiting and live decoys on water- fowl and "estimated that 6,000,000 bushels of corn were fed by Illinois clubs during the 1933 season" (Bellrose 1944: 365). About 1938 initial attention was given to the wood duck, and in 1939 the first successful nesting box of rough-cut lum- ber was developed for this waterfowl spe- cies (Bellrose 1953^). By experimenta-. Wildlife technicians preparing to fluoroscope a mallard drake at the Illinois Natural His- tory Survey field laboratory near Havana. The fluoroscope has facilitated studies involving crippling by hunters and lead poisoning. of waterfowl had received little attention in Illinois. In 1922, at duck hunting clubs near the mouth of the Sangamon River, Dr. Frederick C. Lincoln (1924) of the U. S. Bureau of Biological Survey (now the U. S. Bureau of Sport Fisheries and Wildlife) made the first large-scale bandings of ducks in North America. Francis M. Uhler of the same agency examined the food contents of duck giz- zards collected at the Duck Island Pre- serve in 1933 (Uhler unpublished re- port). Also, Uhler investigated the ef- i tion, a nest box entrance with a 4-inch horizontal measurement and a 3-inch vertical one was evolved in 1942 for the purpose of excluding raccoons which were preying upon the hens and their eggs. In 1950, a cylindrical, galvanized metal house was developed to exclude fox squir- rels, as well as raccoons, as predators on wood duck eggs. Because diversion of Lake Michigan water, drainage, and sediment
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