484 
Journal o f Agricultural Research 
Vol. XXX, No. 5 
the Salt Lake Valley in Utah, and for 
that reason a study of its climate is of 
considerable interest. 
At the station of Tashkent (fig. 2) 
a mean annual temperature of 56° F. 
is found, with five months above 60° 
F. and seven months above 50° F. 
The mean annual maximum is 103° F. 
and the mean annual minimum —4° 
F., the absolute minimum for 30 years 
being —19° F. The rainfall comes 
largely in early spring, March and 
April being the wettest months, with 
conditions very favorable for fungous 
growths. The spring is increasingly 
chosen as typical of conditions in this 
general region. The climate is mari¬ 
time, with fairly evenly distributed 
rainfall. The spring is the driest part 
of the year, with the rainfall gradually 
increasing to a maximum in July, 
when conditions become favorable for 
fungous growth on the alfalfa weevil. 
The summer, like the spring, is cool, 
so that feeding by the weevil must be 
scattered over a long time. A refer¬ 
ence in the Review of Applied Ento¬ 
mology notes larval feeding in July (6). 
This would indicate that growth is 
retarded. Fungous enemies are also 
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dry until July, and the total rainfall 
for the summer months is only 1 inch. 
To judge from the summer tempera¬ 
tures, the frostless season must be well 
over 150 days. The relative humidity 
is 63 per cent for the annual mean and 
48 per cent in July. There is sufficient 
winter precipitation to provide a snow 
cover at the times of subzero tem¬ 
peratures. 
LIMITING CONDITIONS 
Scandinavian countries. —Copen¬ 
hagen, Denmark (fig. 3), has been 
noted. Thus the limiting conditions 
in this region are cool summers and 
too abundant moisture. 
Southern Russia. —Of the three 
governments listed in the table, that 
of Moscow is farthest north and should 
furnish a better index of limiting con¬ 
ditions than either of the others. The 
data from several stations in Kiev and 
Kherson indicate that heavy spring 
rainfall is the limiting factor. The 
climograph for Moscow (fig. 4) shows 
a climate quite similar to that of our 
western plains, although the winter 
