The lake appeared to be surrounded by mountains, but it was afterwards found that these beautiful tree-covered heights were, on the west, only the edges of high table-lands. Like all narrow seas encircled by highlands, it is visited by sudden and tremendous storms. We were on it in September and October, perhaps the stormiest season of the year, and were repeatedly detained by gales. At times, while sailing pleasantly over the blue water with a gentle breeze, suddenly and without any warning was heard the sound of a coming storm, roaring on with crowds of angry waves in its wake. We were caught one morning with the sea breaking all around us, and, unable either to advance or recede, anchored a mile from shore, in seven fathoms. The furious surf on the beach would have shivered our boat to atoms, had we tried to land. The waves most dreaded came rolling on in threes, with their crests, driven into spray, streaming behind them. A short lull followed each triple charge. Had one of these seas struck our boat, nothing could have saved us; for they came on with resistless force; seaward, in shore, and on either side of us, they broke in foam, but we escaped. For six weary hours we faced those terrible trios. A low, dark, detached, oddly shaped cloud came slowly from the mountains, and hung for hours directly over our heads. A flock of night-jars (_Cometornis vexillarius_), which on no other occasion come out by day, soared above us in the gale, like birds of evil omen. Our black crew became sea-sick and unable to sit up or keep the boat's head to the sea. The natives and our land party stood on the high cliffs looking at us and exclaiming, as the waves seemed to swallow up the boat, "They are lost! they are all dead!" When at last the gale moderated and we got safely ashore, they saluted us warmly, as after a long absence. From this time we trusted implicitly to the opinions of our seaman, John Neil, who, having been a fisherman on the coast of Ireland, understood boating on a stormy coast, and by his advice we often sat cowering on the land for days together waiting for the surf to go down. He had never seen such waves before. We had to beach the boat every night to save her from being swamped at anchor; and, did we not believe the gales to be peculiar to one season of the year, would call Nyassa the "Lake of Storms."