the Caldron throws water into its cavity. Tossing a column of water from fifty to sixty feet high, Pohutu plays from one to four times a week, and in some months oftener.
Close to Pohutu, but not dependent on it for activity, is the Prince of Wales Feathers. It throws two small sprays and always plays when Pohutu does, as well as at other times. The terrace from which these two geysers shoot simmers in one place like a frying-pan. At the lower end of the terrace, overlooking Puarenga Creek, is Kereru, "The Pigeon," so named because of the slaty color of its mineral discharges, which form a hard mineral coating in a short time. Kereru is usually most active in the afternoon, and after it has been quiescent three hours it plays from seventy-five to ninety feet high.
In the creek, just below Kereru, is the Torpedo, a phenomenon caused by hot mud coming into contact with cold water. When I saw the Torpedo eleven years ago it was very active, but on my last visit to New Zealand it seldom played. When at its best it lifted, to a height of from one to three feet, a circle of inky black water about ten feet in diameter, the circle rising with unbroken surface until it reached its maximum height, when it exploded with a subdued report. The Torpedo may become just as active again, for it is not more erratic than other phenomena of the district.
Waikite, the twin geyser, for instance, was inactive for a period of thirteen years and four months. It stopped playing when the railroad to Rotorua was opened.
