The midnight trips that Riis and I took enabled me to see what the Police Department was doing, and also gave me personal insight into some of the problems of city life. It is one thing to listen in perfunctory fashion to tales of overcrowded tenements, and it is quite another actually to see what that overcrowding means, some hot summer night, by even a single inspection during the hours of darkness. There was a very hot spell one midsummer while I was Police Commissioner, and most of each night I spent walking through the tenement-house districts and visiting police stations to see what was being done. It was a tragic week. We did everything possible to alleviate the suffering. Much of it was heartbreaking, especially the gasping misery of the little children and of the worn-out mothers. Every resource of the Health Department, of the Police Department, and even the Fire Department (which flooded the hot streets) was taxed in the effort to render service. The heat killed such multitudes of horses that the means at our disposal for removing the poor dead beasts proved quite inadequate, although every nerve was strained to the limit. In consequence we received scores of complaints from persons before whose doors dead horses had remained, festering in the heat, for two or three days. One irascible man sent us furious denunciations, until we were at last able to send a big dray to drag away the horse that lay dead before his shop door. The huge dray already contained eleven other dead horses, and when it reached this particular door it broke down, and it was hours before it could be moved. The unfortunate man who had thus been cursed with a granted wish closed his doors in despair and wrote us a final pathetic letter in which he requested us to remove either the horses or his shop, he didn't care which.