"I'll give her a chance," demurred the flight-sub. "My weight will make a difference. Now, then, old lady; show us what you can do."

Butterfly rose nobly to the occasion. So did the shafts, for the animal walked away leaving the governess-cart in a state of most unstable equilibrium. By dint of hanging on to one of the shafts Billy saved his companion from being deposited upon the ground, while Butterfly, having parted company with the trap, stopped and surveyed the antics of the still oscillating conveyance.

"Never knew a reef-knot to slip like that before," exclaimed Billy, regarding the trailing traces.

"It would be better if the traces were made fast in the orthodox manner, I fancy," suggested Entwistle, alighting from the cart and limping to the shafts. "There, that's the way—although it's not done navy fashion."

Along the main road Butterfly showed no signs of "speed-form." Downhill she walked slowly; uphill she plodded with even less haste, and since it was all either up or down progress was far from swift.

"I'll have to have another shave when we get to Barborough," remarked Billy with an emphasis on the "when." "I scraped at eight this morning, but at this rate I'll have cultivated a beard before Butterfly lands us at your place."

"The first mile," commented Entwistle, pointing to a milestone. "Twenty minutes fifteen seconds. Some record that."

A short distance beyond Blackberry Cross the donkey's manoeuvres began to cause Billy additional alarm. Without any apparent reason Butterfly would describe a semi-circle, keeping her eyes fixed upon something in the road.

"Starboard, you blighter!" roared the amateur driver, tugging at one of the reins. "You'll have us in the ditch in half a shake."

"Peculiar—very," remarked the vet.