four
o'clock
Bob helped them all in and then drove slowly to the Parkney house . The horse had hard work to keep his footing in the water and ice , and he kept shaking his head as though he did not like it . But they reached the house safely , and Mrs. Parkney gave the boys milk to drink and clean dry stockings to wear as though she were used to any emergency , as indeed she was . `` I guess you 've had enough exploring for one day , '' said Bob , as he drove the boys out to the head of the lane to get the half-past four o'clock trolley car . `` If it 's dull out here this summer , I mean to send for you , Sunny Boy , because excitement seems to follow you around . '' The same merry conductor was on the four-thirty trolley car , and he was much interested to hear about the day 's experiences . So were the mothers and fathers when the boys reached home .