THE OUTBREAK OF 1903. 
25 
being complete. The same gentlemen reported the pest present in 
limited numbers during the spring of 1904 in Collin, Hunt, and 
^ 
24.0 • -V.s J" 
°t% £r 
-J"37.0 3*4/ 
1 \ 4|.o\ 
-4.9 \ 
\ 
r U ■ 
1 — ~^r 
1 — 
! 
J -a^ 
— j— XJ 
V -Y 
i V 24.5 
<267 \-4.8 
1-3.2 , 
502. 31.. : \ 
°-9 -i-« ! 52. >£ 
15.0 : •,- 2 -' 3 
V* ^FEBRUARY, 1901. V 
i i ryk$^f\& 
i- — 4 ~ v— \i __^> 
; ._ 1 "Sets ;&o>» \ 
625 .-3.0 -4.8 » 
* APRIL, I90I. 
Diagram HI.— Map of the United States east of the Rocky Mountains, showing normal temperature, 
upper line, and departure therefrom, lower line (+, above normal, and — , below), for the critical period 
December, 1900, to May, 1901; above normal ( + ) in winter and below normal (— ) in spring being 
favorable for outbreak of spring grain-aphis. (Original.) 
Travis counties. This year, however, the parasites evidently did 
more effective service, as at Whitewright, Grayson County, Tex., on 
March 10, 1904, Mr. Sanborn found that 60 per cent of the Toxoptera 
