. Bulletin. Natural history; Natural history. 394 Illinois Natural History Survey Bulletin Vol. 28. Art. 3 on the state bird population. The census data indicate that the 1907 breeding popu- lation of birds in Illinois was conspic- uously lower than the population of 1909, a normal year in terms of weather. The fact that many species had low populations 1906 1907- in 1907 will be mentioned repeatedly in the followinji; text, and the reader should bear in mind that the adverse spring weather of 1907 may have played a role in this depression. The winter of 1908-09 was mild, the following spring
. Bulletin. Natural history; Natural history. 394 Illinois Natural History Survey Bulletin Vol. 28. Art. 3 on the state bird population. The census data indicate that the 1907 breeding popu- lation of birds in Illinois was conspic- uously lower than the population of 1909, a normal year in terms of weather. The fact that many species had low populations 1906 1907- in 1907 will be mentioned repeatedly in the followinji; text, and the reader should bear in mind that the adverse spring weather of 1907 may have played a role in this depression. The winter of 1908-09 was mild, the following spring and sum- — 1908- 1909- 2fcD(rQ:>-z_ioci;i->ozaDQ:(r «IliJ<;333UJOOUJ<uj- z -i iS ti;H>dzoo-z_io <333 UjOOlJ<IiJ<;333 5-3-3<I (nOZQ-)iJ-2<5-5-5< J I I u _l I 1- _l L. PRECIPITATION. LONG ^ TERM AVERAGE H m QC tE >- z ^LJ^Q. ^3 ^ .J uj \^ \^ \ij d uj ; 5-5-iozoDQ:cE>-z_ie> I I. 1. I. I. I. I; I. I I. I. 1^ UJOOUJ<UJ< Q-<33^ 1906- •1907- -1908- 1909- Fig. 9.—Temperature and precipitation deviations from the long-term averages in the northern, central, and southern zones of Illinois during and immediately preceding the years of the bird surveys of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
