File:The American entomologist (1880) (18120665361).jpg

Title: The American entomologist
Identifier: americanentomolo31880newy (find matches)
Year: 1880 (1880s)
Authors:
Subjects: Entomology
Publisher: New York : Max Jaegerhuber
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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THE AMERICAN ENTOMOLOGIST. 241 nois,—the year in which Dr. Shimer ob- served them dying of some disease. Each of these three years follows a preceding dry period of two or three years. Fourthly.—According to this representa- tion, 1878 should be below the average; 1879 above it; 1880 and 1881 dry; and the chinch bugs probably appear in 1881. I have not yet received the records of 1878-9, but expect to examine them before the report is published. That those who have the records and desire to make the comi)arison may do so, I here state that for the average from 1873 to 1877 I use the Signal Service records for Chicago, Dubuque, Davenport and St. Louis, count- ing the year from January to December. As I do not wish to take up too much of your space, the last point I call attention to is the fact that this exhibit shows a de- crease in the amount of rainfall. If we divide the series into sections, and take the mean or average of these divis- ions, the fact of a decrease becomes ap- parent. Dividing into two sections the average is as follows : 1840 to 1858 39-58 inches. 1859 to 1877 36-86 Dividing into three sections: 1^40101851 40.97 inches. 1852 to 1864 36-79 1S65 to 1877 37-IO Dividing into sections of seven years: 1842 to 1848 41-37 inches. 1849 to 1S55 39-12 1856 to 1S62 36.04 1863 to 1869 37-26 1870101876 35-82 Dr. Draper's examination of the rain- fall in New York City, or any point on the sea-coast or larger lakes, cannot form a fair test in reference to the increase or de- crease of rain precipitation. The only rec- ords by which this question can be prop- erly tested are those of the interior of the country. In the accompanying diagram the rain- fall is given in absolute amounts and in- dicated by a heavy line ; the temperature is given in variations from the mean (50°.
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