Fig. 2. is a bird's-eye view of the disruption and the adjoining region, very obligingly sketched by Mr. Derick Barnard of Troy, New-York. The surrounding country is somewhat contracted to bring more of it into view. These are all the facts I am able at present to collect concerning this phenomenon. I have been particular as to the temperature of the air, and the situation of the adjacent country, from an idea that frost was a principal agent in producing it; and that, therefore, these circumstances would be important in fixing a theory. I will not, however, hazard any hypothesis on the subject; but if you deem the fact of sufficient importance, your opinion, Sir, is respectfully solicited. Your humble Servant, EDWARD HITCHCOCK. _Deerfield, Mass. March 26th, 1818._ * * * * * _Deerfield, June 3d, 1818._ SIR, Since I sent you a description of a singular disruption in the earth in this town, another has been observed in the same meadows, about one mile from the former. This is less than the one of which I sent you an account, but its situation is almost exactly similar; it being on a small elevation, on the sides of which, at a few rods distant, is low wet ground. Indeed, the _general_ description which I sent you will answer for this smaller disruption. The diameters of this last, are only 7 and 8 paces, and the curve is not perfect. There appears to have been an expansion of the earth's surface around both these spots, or disruptions, by which it was forced to give way at the point where there was the least resistance, which, of course, would be on the highest ground. The more I observe of this phenomenon, the more I am inclined to impute it to the agency of frost. It may be proper to observe, that in neither of these disruptions has the general mass of the hills sunk in the least. Had this been the case, it might perhaps have accounted for them. It is also certain, that the soil below where it was frozen the past winter, has not been moved. I mentioned this fact in my first communication, though with some suggested doubt. REMARKS. An opinion having been requested by Mr. Hitchcock on the above facts, it may be observed, that there appears in the statement sufficient evidence that the phenomenon (as the author has suggested) is attributable to frost.