All dressed up in her Sunday clothes."

"Don't you feel like a freak?" asked Edith, rather sorry now she had worn her bloomer suit.

"Indeed I don't," answered Letty. "These khaki bloomer suits are the latest fad for 'hikers.' I had a letter from my aunt who is at a fashionable summer resort in Michigan. She said that there was a party of young people spending the week end at the same hotel and that all the young women of the party wore bloomer suits and looked just too cute for anything. They are university students and had walked all the way from Chicago. They were making a study of the sand dunes, lake currents and change of river beds. A professor was with them."

"How delightful," said Mary Lee. "I'd love to join a party like that, only I'd rather study Botany."

By this time the road led into a deep wood where the setting sun flashed its red light through the verdant foliage.

"Isn't this ideal?" exclaimed Edith. "Look at those noble looking trees!"

"What kind are they?" asked Letty. "I never could tell one tree from another."

"Those are red oak and those over there are white," explained Mary Lee.

"They look just alike to me," said Letty. "How can you tell which is which?"

"The red oak has pointed leaves and its acorns ripen every year. But the white oak's leaves are rounded and it takes two years for its acorns to ripen," explained Mary Lee.