The county fair, where Mr. Bobbsey took his children, was a most interesting event, and when they went camping out they had great fun.

But the finding of Baby May was, perhaps, the most mysterious thing that ever happened to the Bobbseys. They found a little baby on their doorstep after a storm, and kept the infant, calling her Baby May Washington Bobbsey, because a queer woman, who had been seen at the railroad station with the baby’s basket, had murmured a name something like “Washington.”

But this proved to be a mistake, since the baby’s right name was Jenny Watson. She was the daughter of Mr. and Mrs. Henry Watson, and had been left in charge of a Mrs. Martin while Mr. and Mrs. Watson made a voyage to South America. Mrs. Martin was Mrs. Watson’s cousin.

Because of an accident, when some dishes fell on her head, Mrs. Martin went crazy and had an idea that she must give Baby Jenny away, which she did, by leaving the infant on the Bobbsey steps.

In due time “Baby May,” the name by which Flossie and Freddie still called the little child, was taken to her mother and father, and Mrs. Martin, who recovered from her crazy spell, and the Watsons became good friends of the Bobbsey family.

Following the excitement over the finding of the baby, the Bobbsey twins had some very strange adventures which you will find set down in the book just before the one you are now reading. That volume is entitled “The Bobbsey Twins Keeping House,” and tells what happened when Mr. and Mrs. Bobbsey had to go away, when Dinah and Sam also departed, and when Mrs. Pry, the housekeeper who had been engaged by Mrs. Bobbsey, was taken ill.

However, everything comes to an end in time, and finally all was straightened out in the Bobbsey house. This took place in the winter, and now it was the beginning of summer, and the eve of Mr. Bobbsey’s birthday.

The mysterious box—at least the twins thought it was mysterious—had arrived, and they were all excited, waiting for their father to come home to open it.

“Isn’t Daddy late to-night?” asked Nan, when she had finished dressing and had gone into her mother’s room.

“No, not later than usual,” answered Mrs. Bobbsey, with a smile as she glanced at the clock on her bureau.