"And could we see the Potomac River?" Bert wanted to know.
"Surely!" laughed Billy's father. "I'll show you all the sights of Washington if you'll come and pay me a visit—all you Bobbsey twins!" he added.
"I wish we could go!" sighed Nan.
"Perhaps you can," said her father.
"Have you got any hay in Wash'ton?" asked Freddie, suddenly, and every one else laughed except himself and Flossie.
"Oh, I guess I could find enough hay for you and your little sister to hide under," answered Mr. Martin with a laugh, for he had heard the story of what had happened in the barn.
A little later Mr. Martin and his boy and girl had to leave. They said "good-bye," and while the father of the Washington children again asked Mr. and Mrs. Bobbsey to come to visit him at his home, Nell and Billy whispered to Nan and Bert:
"Be sure and come, and bring Flossie and Freddie with you!"
"We will!" promised Nan, but neither she nor Bert guessed what a queer little adventure they were soon to have in Washington.
A few days later school opened, and the Bobbsey twins had to go back to their class-rooms. At first they did not like it, after the long, joyous vacation on the deep, blue sea, but their teachers were kind, and finally the twins began to feel that, after all, school was not such a bad place.