2 THU VAUD USB ON Se Be sie ee ey 
The wind began swinging around to the south at 11:30 a.m. We had to 
leave at noon, although the hawks were still going over. When we returned 
at 1:30 p.m., the flight had ceased. 
It is an established fact that the big: flights of birds in the fall — hawks 
as well as smaller birds — take advantage of the polar air masses moving 
southward. The steady northeast wind that morning, together with local 
updrafts, funnelled the birds over this area. The weather map for Sep- 
tember 29 showed a cold front over Minnesota. By September 30 it was 
over Wisconsin and Illinois. On the morning of September 30 the tempera- 
ture was 60 degrees. The cold air mass had arrived overnight and the first 
flocks of juncoes and golden-crowned kinglets were in our back yard. They, 
too, had moved south with the polar air mass. 
606 Thatcher Ave., River Forest, Illinois 
fi ft al 
The. Christmas Bird Gensus slo 
ONCE AGAIN WE urge all members and friends of the Illinois Audubon So- 
ciety to take part in our Annual Audubon Census of birds in the Illinois 
area. This year the period has been extended to include the ten days from 
Friday, December 25 to Sunday, January 3, 1954. Consult your local bird 
club or nature society to learn how you can join their hike. If there is no 
organized group in your vicinity, call up your favorite birding companions, 
drive out to the area you like best, and limber up your binoculars. The 
more people we hear from, the better we like it. 
Birders in the Chicago area are welcome to join the Chicago Ornitho- 
logical Society on their traditional bird walk in the Morton Arboretum on 
Sunday, December 27. The meeting-place is the Administration Building, 
just inside the main entrance, one mile north of Lisle on Route 53, at 9:00 
a.m. This all-day hike is made regardless of weather conditions. It is best 
to call the Field Chairman, Mr. Albert Campbell, 2028 S. Third Ave., May- 
wood, phone FIllmore 38-7780, to check on the exact starting-place and time. 
Reports of your census should be sent early in January to the Bulletin 
Editor, 4835 Wabansia Ave., Chicago 39, Ill. Copies will be forwarded to 
the National Audubon Society if so requested. Please follow the standard 
A. O. U. order and arrange your report in accordance with the style ob- 
served in previous write-ups (see the March, 1953 issue of the Bulletin 
for examples). The following information is needed: terrain covered, miles 
by foot and/or auto, wind, weather, time spent in observations, species 
seen, and names of persons participating. 
Reports should be typed, double space, please, on one side of 8% by 11 
paper. Please be sure that your group submits its findings to the Editor 
(someone on the hike should be appointed to this task before you start for 
home). The deadline for mailing reports is January 15, 1954.- 
