90 
THE WILSON BULLETIN— June, 1922 
Many in full song. A nest with young was shown me in the small 
club house near the golf course. 
9b. Worthington’s Marsh Wren ( Tclmatodytes palustris griseas). 
Heard singing in the marshes daily. 
94. Brown-headed Nuthatch ( Sitta pusilla). 
Only three observed. Probably common and breeding in the pine 
woods. 
95. Blue-gray Gnatcatcher ( Polioptila ccerulea ccerulea). 
Often seen and heard. 
9C. Robin ( Planesticus migratorius migratorius) . 
Only one was seen. This was on the morning of May 6. Does not 
breed here. 
97. Bluebird ( Sialia sictlis sialis). 
Common in the more open areas. One nest noted. 
A MILD WINTER AND ITS EFFECTS ON THE 
MIGRATION OF BIRDS AT CHICAGO 
C. W. G. EIFRIG 
RIVER FOREST, ILLINOIS 
The winter of 1920-21 was a memorable one for its mildness, 
not only for Chicago and vicinity, with which the writer is 
concerned, but for nearly the whole continent. Those members 
of the Wilson Club who attended the last meeting at Chicago 
will perhaps mentally put a question mark behind the statement, 
as regards Chicago at least, for they found the weather decidedly 
boreal during the last days of December, reaching — 4° on the 
28th, and plenty of snow too. But that was about the only 
real wintry spell we had. Lest anyone suspect the writer of 
undue meteorological enthusiasm or a too lively imagination 
along weather lines, let me quote from the official monthly 
summaries of the Chicago bureau. To go back as far as October 
1920: “ The mean temperature for Hie month, 61.9°, was the 
highest October mean recorded since the station was established 
in 1871. Mild weather was continuous from the 3rd to the 27th. 
Frecipitation was about three-fifths of the normal. Sunshine 
was above the normal.” “As a whole, November was mild 
with only light precipitation. The mean temperature, 40.20°, 
was 1° above normal/’ “In December moderate temperature 
prevailed throughout the first half of the month, etc. The max- 
imum was 02° on the 3rd, the minimum was — 4° on the 28th. 
No severe storms occurred, with the exception of a period ex- 
tending from the 13th to the 15th.” “January, as a whole, was 
mild and dry, with no severe storms. Aside from one moder- 
