Unfortunately, for the last three days it had rained heavily, and the deep cart-ruts on both sides of the road were full of thick, muddy water.
In trying to walk along the top of one of them, Peter's foot slipped, and, before he could prevent it, in it went, right over the top of his nice patent-leather shoe.
Isabel, who was following close behind, intently copying her leader in all his movements, plopped hers in too.
"Goodness, what a mess!" said Peter, surveying his muddy foot. "How awful it looks! I think I shall make the other one dirty too, then it won't look so bad."
So in went each clean foot.
And then it was, I am sorry to say, that Isabel forgot to be good. You remember I told you that she did sometimes?
She said: "Now that our feet are dirty, let's paddle, they can't look worse, and it's such fun!" And as Peter thought so too, paddle they did, up and down the dirty, muddy cart-ruts.
Presently Peter's white suit and even his clean tie were spotted with mud, and Isabel's beautiful little dress was soaked with muddy water all round the bottom, and, saddest of all, her new sash was dragging behind her in the water, quite spoilt; but they were so excited that they neither of them noticed how they were spoiling their clothes, or that the parcel with the shaving-tidy in it had been dropped and stamped down into the mud.
They were in the middle of the fun when suddenly they heard in the distance the "toot-toot" of a motor-horn, and, looking at each other in dismay, they realised it must be Auntie May come to fetch them.
"We shall have to change first," gasped Isabel, as they hurried along the road. "I'm afraid we look rather messy!"