Yesterday I went for a long hike along the Wissahickon.  It felt like being somewhere far away but I was just a short drive from the city.  There wasn't a cloud in the sky when we started out.  The air was so clear it felt like it would shatter to the touch.  When I went to bed last night I turned off the air conditioning and opened the windows wide to the night.  It was delightfully cool and I snuggled under my comforter as if I was in Maine.  Is this the beginning of fall for real or just a tease?