The clover they had eaten had made them feel rather sleepy, but now they were beginning to recover from the effects of it, and now they suddenly became quite frisky.  Punch leaped over Judy's back, and then chased her into the middle of the road and back again.  Even old Jumbo caught the infection, and though he very seldom condescended to take any notice of the other rabbits, now he gave Toby a playful poke with his nose, following it up by a bite on his ear that was not quite so playful.  Toby gave a loud squeak of pain, and Jumbo, afraid perhaps that he might receive a bite in return, jumped through the bars and scampered down the field.  He was half-way to the river before the children recovered from their surprise, and shouted to him to come back.  But the more they shouted the faster he ran.  And that was not the worst either, for the other rabbits were after him in a twinkling. But quick as they were Jim was quicker.  He had no intention of allowing such an excellent opportunity of exploring the forbidden ground to slip, and crying that it was of no use to call to Jumbo he scrambled over the gate and rushed helter-skelter down the field, taking great care, however, not to get in front of Jumbo, but running behind him shouting and waving his hands.