Revived Geyser

Yellowstone National Park's Splendid Geyser, after 39 years silent digestion of water, steam, rock and heat, last week labored and threw up a 100-ft. spout of steaming water. Daisy Geyser nearby, which has been erupting every 100 min. ever since white men have known it, paused. After a two-hour delay Daisy went to work again. Old Faithful, some distance away, faithfully continued its 65-min. spouting, but small geysers, boiling springs and mudholes nearer the Splendid were drained of their waters. Two park employes posted themselves beside the Splendid to record its behavior.

Japan, the Malay Archipelago and South America have geyser regions. But they do not compare in number or size to those of Iceland, New Zealand or Yellowstone. Yellowstone's are the biggest and best to look at.

Geysers are caused when water plugs a vent from the earth's hot interior to the surface. The interior heat boils the deep water, which at first cannot escape because of the weight of the water higher up in the hole. A moment arrives when steam pressure is enough to lift all the water out of the hole. At that moment practically all the pent water suddenly changes to steam. The geyser spouts, subsides, until the critical steam pressure is again built up by subterranean heat.

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