“A little after 11 o’clock A.M., soon after high-mass in the Roman Catholic cathedral, and while divine service was still going on in the Anglican and Wesleyan chapels, all the indications of an approaching thunder-storm suddenly showed themselves; the atmosphere, which just previously had been cool and pleasant—­slight showers falling since early morning—­became at once nearly stifling hot; the rumbling of distant thunder was heard, and the light-blue and fleecy white of the sky turned into a heavy and lowering black.  Soon the thunder-peals came near and loud, the lightning flashes, of a blue and red color, more frequent and vivid; and the rain, first with a few heavy drops, commenced to pour as if the floodgates of heaven were open.  In a moment it darkened, as if night had come; a strong, nearly overpowering smell of sulphur announced itself; and people who happened to be out in the streets felt the rain-drops falling on their heads, backs, and shoulders like showers of hailstones.  The cause of this was to be noted by looking at the spouts, from which the water was rushing like so many cataracts of molten lead, while the gutters below ran swollen streams of thick gray mud, looking like nothing ever seen in them before.  In the mean time the Roseau River had worked itself into a state of mad fury, overflowing its banks, carrying down rocks and large trees, and threatening destruction to the bridges over it and the houses in its neighborhood.  When the storm ceased—­it lasted till twelve, mid-day—­the roofs and walls of the buildings in town, the street pavement, the door-steps and back-yards were found covered with a deposit of volcanic debris, holding together like clay, dark-gray in color, and in some places more than an inch thick, with small, shining metallic particles on the surface, which could be easily identified as iron pyrites.  Scraping up some of the stuff, it required only a slight examination to determine its main constituents—­sandstone and magnesia, the pyrites being slightly mixed, and silver showing itself in even smaller quantity.  This is, in fact, the composition of the volcanic mud thrown up by the soufrieres at Watton Waven and in the Boiling Lake country, and it is found in solution as well in the lake water.  The Devil’s Billiard-table, within half a mile of the Boiling Lake, is composed wholly of this substance, which there assumes the character of stone in formation.  Inquiries instituted on Monday morning revealed the fact that, except on the south-east, the mud shower had not extended beyond the limits of the town.  On the north-west, in the direction of Fond Colo and Morne Daniel, nothing but pure rain-water had fallen, and neither Loubiere nor Pointe Michel had seen any signs of volcanic disturbance. . . .