At no great distance ahead of us the river-valley made a turn, above which, westwards and south-wards as far as the eye could reach, stretched a dense underwood. Soon afterwards we descended for the second time into the river-valley of the Sirorume, designated by the English as the “brack reeds.” Here for miles both ways the river-bed is flat, and forms a sort of fen overgrown with rushes. I crossed this no less than three times, on each occasion finding it very prolific in puff-adders. Our search for drinking-water proved unavailing, and as our stock of meal was rapidly diminishing, we felt the necessity of hurrying on as quickly as possible; but on the 21st we came on the top of the tableland upon one of those unexpected rain-pools, which I described in my account of my first journey.
Three days before, I had shot two specimens of the puff-adder (Vipera arietans), each over three feet long, and as thick as my arm; they had heart-shaped heads, and two very long and crooked fangs. The scaly skin of this snake varies in colour from yellow to dark brown, consisting of alternate light and dark bands. It is to be met with almost everywhere between the sea and the Zambesi, but is far more abundant in some districts than in others; especially frequenting places overgrown by thorns, as less hable to be visited by snake-eagles. Most of the specimens I saw were lying dormant on the margins of thickets, or on the edges of pathways, coiled round and round, and flat as a platter; their sluggishness is quite remarkable, and
