THIRTEENTH ANNUAL REPORT OF THE DIRECTOR. 15 
line, and the average mean monthly temperature for the 
past thirty-one years in a dotted line, as derived from the © 
current monthly bulletins of the St. Louis station of the 
United States Weather Bureau. Taking account of the 
minimum as well as the maximum temperatures, this dia- 
gram shows even more clearly the excessive warmth of the 
past year, between the months of May and November. 
DIAGRAM B., 
90— 
R. APR. MAY JUNE JULY AUG, Seri. OC. 
MEAN MONTHLY TEMPERATURES. 
On the diagram marked C, the full line, 1, represents 
cumulatively the precipitation for 1901, amounting to 24.8 
inches, as shown by the same monthly bulletins of the 
Weather Bureau, from which has been platted, also, the 
contrasted dotted curve, 2, representing the average precip- 
itation for the last thirty-one years, amounting to 37.27 
inches annually. It will be observed that the rainfall for 
1901, which at no time before December reached the 
average, though in December, because of one heavy shower, 
it exceeded it, has otherwise continually fallen behind the 
latter, until at the end of the year it is 12.47 inches short 
of the yearly average of 37.27 inches. 
In compiling this curve, I was struck with the great dif- 
