As we lay down, the volcanoes in the Dyngjufjöll were smoking away with increased violence. My frost-bitten toe would not allow me to sleep much, so after a doze of two hours we started on our way; we had but two days’ full rations left, and as Grímstaðir was the nearest farm, a series of forced marches was necessary. Before us to the N.E. was a cluster of hills, which stretched from the southern extremity of the Dyngjufjöll in a S.E. direction towards the Jökulsá, upon the east and west sides of which valleys appeared to open northwards. Wishing, however, to get a good view of the country before us, as neither of us had been here before, and it was a matter of paramount importance that we should make no mistake as to the direction, I decided to steer for the centre of the hills, and to cross them. For a short distance we skirted the tongue of the Jökull, past a line of moraine which shewed that the glacier had ebbed as well as flowed, then bearing more to the north, after a hard walk of three hours we reached the hills before us. They were composed of the usual confusion of agglomerate, sand and lava, which had issued from it--it was impossible to say where; but they were evidently of a very ancient date, and many of the harder rocks were glaciated, while the softer ones were simply ruinous heaps. After an arduous scramble, we crossed these hills and reached the little desert of black volcanic sand we had seen from the northern edge of the Vatna Jökull. This sand plain lay between the Dyngjufjöll and a chain of mountains upon the opposite side of the Jökulsá-á-fjöllum. It was now raining somewhat heavily, but there was no fog; the burdens of my men were heavy, and I was carrying all I could manage with my bad foot. Under these conditions we were obliged often to rest, which much hindered in our progress. We sighted some low, black, misshapen volcanoes, about half way across the plain, and near these we determined to camp for the night. Two hours brought us to a field of lava which had flowed from and surrounded those eccentric little volcanoes which rose in four ghastly eminences in the centre of the plain, in no part more than 100 feet high. Tired as I was, and greatly inconvenienced by my foot, I could not refrain from examining them. They were situated upon a crack from which the lava had welled up in four mamelonic shapes, which in two instances showed irregular breached craters, nearly filled with sand, which had been drifted thither by the wind. The lava was basaltic, and of a remarkably scoriaceous nature, though in the immediate neighbourhood of the volcanoes no cinders were visible around them, so their eruptions must have been attended with but little of explosive character.