Pili eae LOA ONE Ul ly het lan 23 
What has happened in the five years intervening? An article in the 
Chicago Daily News on June 20, 1968 reports that the Chicago City Council 
has just adopted 17 air pollution control code amendments, designed to re- 
duce pollution by more than 50 per cent within the next four-and-one-half 
years. Basically, the amendments cover the following standards and 
limitations: 
1. A 60 per cent reduction—50,000 tons—in emission of solid dust par- 
ticles from fuel-burning units. 
2. Limitations on industrial operations to produce an additional 40,000- 
ton-a-year reduction in such pollutants. 
3. Elimination—within two years—of garbage burning in coal burners 
and unapproved incinerators, and in furnaces not specifically designed for 
such purpose. 
4. Limitation of the sulphur content of fuel burned in Chicago. This 
will be done gradually, with the goal of reducing sulphur dioxide content 
by 50 per cent in four-and-one-half years. In addition, all open fires, in- 
cluding the burning of leaves, will be prohibited in two years. 
The city of Chicago showed wisdom and foresight in starting this time- 
consuming and expensive program early. Now, with adequate and enforc- 
able legislation assured, Chicago’s hopes of “reasonably clean air” may 
soon become a reality. 
=v leo are Zarich 
Chicago Nature Photography Exhibition—1969 
Nature Photographers, Attention! 
You are invited to participate in the 
24th Chicago International Exhibition 
of Nature Photography. Match your 
best nature pictures against those of 
the finest photographers from all 
over the world. The illustration at 
left was one of the winners in a 
previous exhibition. Eleven silver 
medals and scores of honorable men- 
tion ribbons are awarded to makers 
of the top prints and color slides. 
The exhibition is sponsored by the 
Chicago Nature Camera Club and 
; ae the Field Museum of Natural His- 
Barn Owl: Leslie Campbell tory. Deadline for entries is January 
13, 1969. Fees are $1.00 plus return 
postage for four slides and/or $1.00 plus return postage for four prints. 
Pictures of any natural history subject—botany, birds, marine life, geology, 
landscapes and seascapes—are acceptable. Slides will be projected in the 
James Simpson Theater of the Museum on two Sundays—Feb. 2 and Feb 9, 
1969, at 2:30 p.m. Acceptable prints will be displayed in the Museum from 
Feb. 1 through Feb. 24. The panel of distinguished judges includes Floyd 
Swink, Taxonomist of the Morton Arboretum and a former Director of the 
LA.S. For entry blanks, write to Paul H. Lobik, 22W681 Tamarack Drive, 
Glen Ellyn, Illinois 60137. 
