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., 



Diagram 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 



