David J. Kennedy at Arthur Ross Gallery. The Historical Society of Pennsylvania, at 13th and Locust Streets, has the largest holdings of watercolors by David J. Kennedy but rarely has had the opportunity to exhibit them. Now, some of his fetching views of the city, loaned by the society to the University of Pennsylvania's Arthur Ross Gallery, are the stars of "West Philadelphia: Building a Community." Kennedy, a Scot, was a railroad clerk who taught himself to paint and went on to capture most of Philadelphia on paper. The English artist William Birch already had depicted views of Philadelphia in his popular prints, but did not take nearly as exhaustive an approach as Kennedy, who seemed possessed by his adopted city. It's fair to say he did for Philadelphia what the photographers Eugene Atget and Berenice Abbott did for Paris and New York, but earlier. (Through Oct. 11; 215-898-2083 or www.upenn.edu/ARG.)