The Thames Valley Catastrophe

I tried vaguely to discover the source of the disaster. Looking straight up stream, past Bourne End and Marlow, I descried with bleared and dazzled eyes a whiter mass than any, glowing fiercely in the daylight like an electric light, and filling up the narrow gorge of the river towards Hurley and Henley. I recollected at once that this portion of the valley was not usually visible from Hedsor Hill, and almost without thinking of it I instinctively guessed the reason why it had become so now: it was the centre of disturbance--the earth's crust just there had bulged upward slightly, till it cracked and gaped to emit the basalt.

Looking harder, I could make out (though it was like looking at the sun) that the glowing white dome-shaped ma