In the Zone

Image Credit: Dr. Richard Alan Keen

“The summer climate of Philadelphia, and other large cities similarly situated, is an artificial torrid zone, in which the thermometer rises from four to six degrees higher as it does at a distance of a few miles in the country.”

This was Charles Caldwell, a physician, in 1801.

Caldwell was trying to understand why Yellow Fever, a tropical disease, kept recurring in Philadelphia in the 1790s. The chief contributors to Philadelphia’s “factitious climate,” according to Caldwell: deforestation, overbuilding, fuel use, and pavement.

Sound familiar?

About the author

Nathaniel Popkin is co-founder of the Hidden City Daily and author of three books of non-fiction, including Philadelphia: Finding the Hidden City (with Peter Woodall and Joseph E.B. Elliott) and two novels, Everything is Borrowed and Lion and Leopard. He is co-editor of Who Will Speak for America, an anthology forthcoming in June 2018, and the senior writer of the film documentary "Philadelphia: The Great Experiment."



Leave a Reply

Comment moderation is enabled, no need to resubmit any comments posted.

Recent Posts
Lost In The Shuffle: Finding Philly's Displaced Soldiers

Lost In The Shuffle: Finding Philly’s Displaced Soldiers

May 25, 2018  |  Vantage

In honor of Memorial Day, Mickey Herr tracks the reinterred remains of soldiers who fought in the American Revolution and Civil War from Washington Square to Palumbo Recreation Center to Old Swedes' Church in South Philly > more

<em>Ours To Lose</em> Captures West Philly Landmarks In Decline

Ours To Lose Captures West Philly Landmarks In Decline

May 23, 2018  |  Vantage

Photographer Vincent Feldman delivers a eulogy for neglected neighborhood anchors in his new exhibition. Michael Bixler has this interview > more

PA Ballet Swings Wrecking Ball At North Broad Landmark

PA Ballet Swings Wrecking Ball At North Broad Landmark

May 21, 2018  |  News

A 107-year-old terra cotta treasure on Automobile Row will be demolished for a vacant lot. Michael Bixler has the story > more

Kensington Workshop Keeps Neighborhood Clocking In

Kensington Workshop Keeps Neighborhood Clocking In

May 16, 2018  |  Last Light

Inside a 124-year-old mill in Kensington, World Manufacturing Inc. is buzzing with work orders. Theresa Stigale puts us on the production line with this photo essay > more

Take Me Up To the Ball Game! Rediscovering The Bleacher Houses Of North Philly

Take Me Up To the Ball Game! Rediscovering The Bleacher Houses Of North Philly

May 15, 2018  |  Vantage

Dave Coyne gives us a rooftop view of old Shibe Park and the backstory behind Swampoodle's little-known "bleacher houses" > more

On Motherhood & The Circle Of Life At City Hall

On Motherhood & The Circle Of Life At City Hall

May 11, 2018  |  Soapbox

For Mother's Day, Stacey Meadows takes us inside the Register of Wills office at City Hall with this moving personal essay > more