Everything warned Bobby to lie still in safety until morning and the world was restored to its normal aspects. But ah! in the highest type of man and dog, self-sacrifice, and not self-preservation, is the first law. A deserted grave cried to him across the void, the anguish of protecting love urged him on to take perilous chances. Falling upon a narrow shelf of rock, he had bounded off and into a thicket of thorns. Bruised and shaken and bewildered, he lay there for a time and tried to get his bearings. Bobby knew only that the way was downward. He put out a paw and felt for the edge of the shelf. A thorn bush rooted below tickled his nose. He dropped into that and scrambled out again. Loose earth broke under his struggles and carried him swiftly down to a new level. He slipped in the wet moss of a spring before he heard the tinkle of the water, lost his foothold, and fell against a sharp point of rock. The shadowy spire of a fir-tree looming in a parting of the vapor for an instant, Bobby leaped to the ledge upon which it was rooted. Foot by foot he went down, with no guidance at all. It is the nature of such long, low, earth dogs to go by leaps and bounds like foxes, calculating distances nicely when they can see, and tearing across the roughest country with the speed of the wild animals they hunt. And where the way is very steep they can scramble up or down any declivity that is at a lesser angle than the perpendicular. Head first they go downward, setting the fore paws forward, the claws clutching around projections and in fissures, the weight hung from the stout hindquarters, the body flattened on the earth. Thus Bobby crept down steep descents in safety, but his claws were broken in crevices and his feet were torn and pierced by splinters of rock and thorns. Once he went some distance into a cave and had to back up and out again. And then a promising slope shelving under suddenly, where he could not retreat, he leaped, turned over and over in the air, and fell stunned. His heart filled with fear of the unseen before him, the little dog lay for a long time in a clump of whins. He may even have dozed and dreamed, to be awakened with starts by his misery of longing, and once by the far-away barking of a dog. It came up deadened, as if from fathoms below. He stood up and listened, but the sound was not repeated. His lacerated feet burned and throbbed; his bruised muscles had begun to stiffen, so that every movement was a pain.