The professor had hardly spoken and obtained his reply before Mr Burne, who had been refreshing himself with a pinch of snuff, whisked out his handkerchief according to his custom.
They were now going along a valley which ran between too highish walls of rock, dotted here and there with trees—just the sort of place, in fact, where anyone would be disposed to shout aloud to try if there was an echo; but the idea had not occurred to either of the travellers, whose thoughts were bent upon overtaking the baggage animals with their stores, when quite unexpectedly Mr Burne applied his handkerchief to his face and blew his nose.
It was not one of his finest blasts, there was less thunder in it, and more high-pitched horn-like music, but the effect was electrical.
There was an echo in that valley, and this echo took up the sound, repeated it, and seemed to send it on to a signalling station higher up, where it was caught and sent on again, and then again and again, each repetition growing weaker and softer than the last.
But only one of these echoes was heard by the travellers, for, as afore said, the effect was electrical.
The moment that blast was blown behind him, Ali Baba, Lawrence’s cream-coloured horse, threw up his head, then lowered it, and lifted his heels, sending his rider nearly out of his saddle, uttered a peculiar squeal, and set off at a gallop.
The squeal and the noise of the hoofs acted like magic upon the other three horses, and away they went, all four as hard as they could go at full gallop, utterly regardless of the pulling and tugging that went on at their bits.
This wild stampede went on along the valley for quite a quarter of an hour before Yussuf was able to check his steed’s headlong career; and it was none too soon, for the smooth track along the valley was rapidly giving way to a steep descent strewed with blocks of limestone, and to have attempted to gallop down there must have resulted in a serious fall.
As it was, Yussuf was only a few yards from a great mass of rock when his hard-mouthed steed was checked; and as the squeal of one had been sufficient to start the others, who had all their early lives been accustomed to run together in a drove, so the stopping of one had the effect of checking the rest, and they stood together shaking their ears and pawing the ground.
