The two were kneeling on the ground by the side of the packing-case, much absorbed in the process of exact measurements, when suddenly there was a rustling and a scrambling noise, and on the wall close to them appeared a collie dog, growling, snarling, and showing its teeth. Ingred sprang to her feet in alarm. Wynchcote was so retired that they had scarcely realized that its garden adjoined the garden of another house. The collie must have jumped up on to the dividing wall, and, being an ill-tempered beast, did not use proper discrimination between neighbors and tramps.

"Shoo! Get away!" urged Ingred, with rather shaking knees.

"Be off, you ill-mannered brute!" shouted Hereward.

The dog, however, appeared to think the wall was his own special property, and that it was his business to drive them away from their own garden. It continued to bark and snarl. Now, as Hereward wished to fix the rabbit-hutch in exactly the spot over which the creature had mounted guard, he was naturally much annoyed, and sought for some ready means of dislodging it from its point of vantage. He did not relish the prospect of being bitten, so did not want to engage it at close quarters, and no pole or other weapon lay handy.

Looking hastily round, his eye fell upon the garden-syringe with which Athelstane sometimes cleaned the motor-bicycle. It had been left, with a bucket of water, outside the shed. He drew out the piston, filled the syringe, then discharged its contents straight at the dog. But at that most unlucky moment a quick change took place on the wall; the collie retired in favor of his master, and the stream of water charged full into the astonished countenance of a precise and elderly gentleman from next door. For a few moments there was a ghastly silence, while he wiped his face and recovered his dignity. Then he demanded in withering tones:

"May I ask what is the meaning of this?"

Ingred and Hereward, overwhelmed with confusion, stuttered out apologies and explanations. The old gentleman listened with his busy gray eyebrows knitted and his mouth pursed into a thin line.

"I shall immediately take steps to ensure that my dog has no further opportunities of annoying you," he remarked stiffly, and took his departure.

"Who is he?" whispered Ingred, as the footsteps on the other side of the wall shuffled away.

"His name's Mr. Hardcastle. He's retired, and lives there with a housekeeper. Great Scot! I've put my foot in it, haven't I? Who'd have thought he was just going to pop his head up? Dad was going to ask him to lend us his garden-roller, but it's no use now. I expect I've made an enemy of him for life!"