It was Sunday afternoon in August, and Sinnott Memorial was full almost to the parapet. The lecturer had finished his discussion of the cycles of eruption and quiet. Trying to stir the interest of his audience, he started speculation on the possibilities of renewed volcanic activity. To ease any fears which they might have about the mountain exploding under their feet, he mentioned that any major eruption would undoubtedly be preceded by loud rumblings and at least some vibration of the earth. At this moment a tremendous roar struck the intent faces of his listeners. It was a full five seconds before the taut, fearful expectancy was broken by a nervous laugh. One by one visitors resumed breathing as they caught sight of the first jet planes to buzz Crater Lake disappearing over Llao Rock.