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. 
9i>. Worthington’s Marsh Wren (Telmatodytes palustris griseus) . 
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 cceriilea cwrulea). 
Often seen and heard. 
9G. Robin (Planesticus migratorius migratorius) . 
Only one was seen. This was on the morning of May 6. Does not 
breed here. 
97. Bluebird (Sialia slalis 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 1020-21 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 
iindiie meteorological enthiisiasni or a too lively imagination 
along weather lines, let me quote from the official monthly 
sninmaries of the Chicago bnreaii. To go back as far as October 
1020: “The mean temperature for the month, 61.9°, was the 
highest October mean recorded since the station was established 
in 1871. Mild weather was continiioiis from the 3rd to the 27th. 
I‘recipitation 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.” ^Hn December moderate temperatiire 
prevailed throiighont the first half of the month, etc. The max- 
imnni was 62° on the 3rd, the niinininm 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 nioder- 
