four o'clock
Patty watched Nan curiously , as she put the wig on , securing it to her head by invisible springs . `` I never saw anybody with a wig before , '' she said , `` and it surprises me so ; but I came to ask you to go swimming with us . '' `` Ca n't do it , '' said Nan ; `` I have two more letters to write , and then I 'm going driving with the Perrys . They 're to call for me at four o'clock , and it 's after three now . You 'll have to go without me this time . '' `` All right , '' said Patty , backing out of the room , for her eyes were still fixed on the wonderful wig . Then she rejoined her cousins , and they all ran to the bath-houses .