| Stone arch bridge. |  |  | 
					
				| General view of Lawrence. |  |  | 
					
				| Hoosac Tunnel, east portal and mountain. |  |  | 
					
				| Hoosac Tunnel, east portal and mountain. |  |  | 
					
				| Hoosac Tunnel, east portal and mountain. |  |  | 
					
				| Interior view of Hoosac tunnel. |  |  | 
					
				| Hoosac Tunnel. |  |  | 
					
				| The new air compressors which furnish power to drive the drills, about 500 feet below the surface of the earth. |  |  | 
					
				| The new air compressors which furnish power to drive the drills, about 500 feet below the surface of the earth. |  |  | 
					
				| Miners descending the west shaft with the Burleigh Drill. |  |  | 
					
				| Dam on the Deerfield. |  |  | 
					
				| East end of tunnel, showing bed of road. |  |  | 
					
				| East end of tunnel, showing bed of road. |  |  | 
					
				| West end from the original surface standpoint, looking north-east. |  |  | 
					
				| West end, showing the brick arch. |  |  | 
					
				| West end, showing the brick arch. |  |  | 
					
				| Miners descending the west shaft. |  |  | 
					
				| View of the central shaft after a naptha explosion (1867) where thirteen were killed, showing people at the top of the shaft awaiting the recovery of bodies. |  |  | 
					
				| Lover's retreat near nat. bridge. |  |  | 
					
				| Natural bridge, looking down stream. |  |  | 
					
				| Natural bridge, looking up stream. |  |  | 
					
				| Stone dam at glan mill. |  |  | 
					
				| Hoosac house and mountain. |  |  | 
					
				| Prof. Mowbray's nitro-glycerine works at the west shaft, North Adams, Mass. |  |  | 
					
				| Railroad and river. |  |  | 
					
				| Hoosac Tunnel, west end. |  |  | 
					
				| Deerfield dam. |  |  | 
					
				| Hoosac mountain. |  |  | 
					
				| Entrance to tunnel, east end. |  |  | 
					
				| Entrance to tunnel, west end. |  |  |