THE OUTBREAK OF 1890. 
21 
destroyed a field of 60 acres of oats belonging to Hon. Roland Hazard 
at Mine Le Motte, situated about 100 miles south of St. Louis, Mo., 
Diagkam II.— Maps of the United States east of the Rocky Mountains, showing normal temperature, 
upper line, and departure therefrom, lower line (+, above normal, and — , below normal), for the 
critical period December, 1889, to May, 1890; above normal ( + ) in winter and below normal (— ) in 
spring being favorable for outbreak of spring grain-aphis. (Original.) 
the observations being made June 10, 1890. In Missouri the situa- 
tion appears to have been pretty clearly set forth by Colman's Rural 
World, then the leading agricultural paper of the Southwest. In the 
