THIRTEENTH ANNUAL REPORT OF THE DIRECTOR. 17 
tively short time prove most disastrous to agriculture as 
well as gardening in this section. Further data bearing on © 
this question are afforded by a paper by Professor Nipher 
(Trans. Acad. Sci. of St. Louis. 5: 383-433), from which 
the following figures are taken: 1837-1855, 42.43 in. 
DIAGRAM D. 
= 
yl , att 5 
, .. 
, ts b ‘ 
7 jeeer™ v \ 
oon” N 
4 + 
a}? ‘ 
ig VA ‘ 
“7 X - 
- \ ¢ 
ul ad 
* a a LY Po 
| ad > Ve 
2 ac. ‘\ 
q 7 a 
3 |? fe 
<: a 
# ‘. 
va 
7 Mee 
1 Pia pias 
pote ee 
BAN. FEB. MAR. APR. MAY JUNE JULY AUG, SEPT. OCT, NOV, DEC 
PRECIPITATION — BY MONTHS. 
(Smithsonian tables); 1841-1861, 40.67 in. (Jefferson 
Barracks); 1862-1879, 38.73 in. (Engelmann); 1871- 
1887, 38.56 in. (Weather Bureau); and 1878-1887, 38.60 
in. (Washington University). 
Unlike the temperature, the rainfall for this season has 
nowhere reached the extreme noted by Dr. Engelmann, 
whose minimum monthly records are shown by the dotted 
line, 4, on this diagram, though in November the precipita- 
tion was only .1 in. higher than the November minimum 
shown by his tables. 
As a result of the unfavorable season, a few established 
trees, and a considerable number of others newly planted, 
and therefore with deficient root system, died or showed 
