The Encyclopedia of Greater Philadelphia has been growing rapidly this summer, and we are pleased to announce that the project has reached a new milestone: 550 topics published online. The 550th essay to be published is Dispensaries, by Steven J. Peitzman, a longtime contributor who participated in one of our early Greater Philadelphia Roundtable programs, “City of Firsts.” He has written two previous essays for The Encyclopedia: City of Medicine and Typhoid Fever and Filtered Water.