AN APPALLING CALAMITY.Details of the Disaster in WesternMassachusetts.OVER TWO HUNDRED LIVES LOST !Whole Families Swept Away by the Flood—Gathering Up the Dead.FEARFUL SCENES OF DESOLATION.Large Structures of Stone and Brick Overturned by the Torrent.FULL LIST OF THE LOST.Upwards of $3,000,000 Worth of Property Destroyed,Til BILLING INCIDENTS-NIRBOW ES0APE8.The Gate-Keeper's Ride to Williamsburg —Heroism of Collins Graves,CAUSE OF THE CATASTROPHE.Etc.. EJto., Eto.{WECIAf. DESPATCH TO TUS BOSTON POST.]^ woiksthe water cut a channel about aeventj feet wide, and at the Hospital meadows the water poured in great volume over the abutments.AT NORTHAMPTONthe water rose far above West street, and numerous ditches and culverts now mark the places that only a few days ago were noted for their beautiful and symmetrical appearance. All the houses above the dam here were either washed away or badly wrecked, but the iloe Factory, which is above, was left standing and sustained but slight damage. During the morning Uie West street iron bridge, a tine structure, was swept away; the South street bridge wa§ considerably damaged, aud the railroad bridge over the II. and N. R. R. was entirely destroyed, The buildings of the International Screw Company were more or less damaged, as was also several small dwelling-houses close by. The occupants, however, had ample time to escape from their homes before the flood reached them.THF PROPERTY LOSS.The total number of buildings destroyed is about forty; also twenty bridges, including twelve of iron, one of stone and the remainder of w ood. The total amount of property destroyed by the flood, and as estimated by various geutleraen who were engaged in manufacturing on the river, will not fall short of $3,000,000, and of course this is dead loss, there being nothing to cover the damage as in case of fire. Undoubtedly several branches of trade carried on here will be abandoned as far as Mill river is concerned* such being the sentiments of not a few ot the business men here.NAMES OF THE LOST.The names of the people who perished by drowning and from other causes by this appalling calamity, as lar as can bo ascertained up to late this evening, are as follow s, beginning with those who resided in tho town of Williamsburg, which includes Skinner-villeand llaydenvilJe:—IN WILLIAMSBURG.Dr E. M. Johnson, wife and three children.Mrs Elbridge Kingsley.Mrs Elbridge Kingsley, Jr., and two children. Henry Birmingham (superintendent of James’s iactory). wife and three children,Mrs Dwight Adams and two children,Mrs Jerome Hillman,Mrs Albert Lamb.Conductor Chandler’s wife and child.Cliriatiau Kepler, wife and daughter.Mrs Jacob Hill.Ely Bryaut.Robert Hayden,a little sou of Capt. Joseph Hayden. Mrs Morris.Miss Johanna Williams.Two young children belonging to Edward Thayer. Mrs Hogan.Edward Moakler.Francis JBroodeo.Three children belonging to Henry Melor.Mrs John Williams and three children.