about two o'clock
I was visiting my sister in Philadelphia with them both . It was in May , but it was very warm . The children were still in the habit of taking an afternoon nap . One day they were put to bed , as usual , about two o'clock , and my sister and myself went down-town for some shopping . I had a new nursemaid , whom I left in charge , of course . But she was careless , I suppose , and probably went down-stairs to gossip with the other servants . `` Presently the children woke up , and as they found there was no one with them , they slipped off the bed by themselves .