On the 16th of June, 1794, a tremendous cloud was seen in Tuscany, near Siena, and Radacofani; coming from the north, about seven o'clock in the evening;--sending forth sparks, like rockets;--throwing out smoke like a furnace;--rendering violent explosions, and blasts, more like those of cannon, and of numerous muskets, than like thunder;--and casting down to the ground hot stones:--whilst the lightning that issued from the cloud was remarkably red; and moved with _less_ velocity than usual. The cloud appeared of different shapes; to persons in different situations; and remained suspended a long time: but every where was plainly seen to be burning, and smoking like a furnace. And its original height, from a variety of circumstances put together, seems to have been much above the common region of the clouds. The testimony, concerning the falling of the stones from it, appears to be almost unquestionable:--and is, evidently, from different persons, who had no communication with each other. For first; the fall of four stones is precisely ascertained: one of which was of an irregular figure, with a point like that of a diamond;--weighed five pounds and an half;--and had a vitriolic smell.--And another weighed three pounds and an half;--was black on the outside, as if from smoke;--and, internally, seemed composed of matter of the colour of ashes;--in which were perceived small spots of metals, of gold and silver. And, besides these, Professor Soldani of Siena, was shewn about fifteen others: the surfaces of which were glazed black, like a sort of varnish;--resisted acids;--and were too hard to be scratched with the point of a penknife. Signior _Andrew Montauli_, who saw the cloud, as he was travelling, described it as appearing much above the common region of the clouds; and as being clearly discerned to be on fire;--and becoming white, by degrees; not only where it had a communication, by a sort of stream of smoke and lightning, with a neighbouring similar cloud: but also, at last, in two-third parts of its whole mass, which was originally black. And yet he took notice, that it was not affected by the rays of the sun, though they shone full on its lower parts.--And he could discern as it were the bason of a fiery furnace, in the cloud, having a whirling motion. This curious observer gives an account also, of a stone, which he was assured fell from the cloud, at the feet of a farmer; and was dug out of the ground, into which it had penetrated.--And he says, that it was about five inches long, and four broad; nearly square; and polished: black on the surface, as if smoked; but within, like a sort of sand-stone, with various small particles of iron, and bright metallic stars. Other stones are described by him; which were said to have fallen at the same time: were triangular; and terminated in a sort of (pyramidal) or conical figure.--And others were so small as to weigh not more than an ounce.