Whenever it shall be made to appear to the satisfaction of the governor and council, that the Troy and Greenfield Railroad Company shall have actually obtained unconditional subscriptions to their corporate stock in the sum of six hundred thousand dollars, and twenty per cent. on each and every share of said six hundred thousand dollars shall have been actually paid in, and shall have completed seven miles of their road, in one or two sections, and one thousand lineal feet of their said tunnel under the Hoosac Mountain, in one or more sections, of size sufficient for one or more railroad tracks, a portion of said scrip, to the amount of one hundred thousand dollars, shall be delivered to the treasurer of said company; and whenever said company shall have, excavated, in addition to the amount of tunnel above provided for, one thousand lineal feet, in one or more sections, of heading or gallery of fourteen feet width at the bottom, and six feet in height in the middle, and of suitable proportion and form, or (if excavated by machinery) circular, and with a diameter of not less than eight feet, another portion of said scrip, amounting to fifty thousand dollars, shall be delivered to the treasurer of said company; and when said company shall have excavated two thousand feet of their said tunnel, of the size above specified, another portion of said scrip, amounting to thirty thousand dollars, shall be delivered as aforesaid; and whenever said company in addition to said two thousand feet, shall have excavated one thousand lineal feet of heading, in one or more sections, and of the size above specified, and shall have graded three miles of road, commencing on the bank of Green River, at the present location of the crossing of said stream, or north thereof, and extending towards Shelburne Falls, on the same side of Green River and Deerfield River as the present location, said three miles being all situated within four miles of the point of commencement, another portion of said scrip, amounting to eighty thousand dollars, shall be delivered as aforesaid; and whenever in addition to the grading of said three miles as above, said company shall have excavated three thousand lineal feet of tunnel as above specified, another portion of said scrip, to the amount of twenty thousand dollars, shall be delivered as aforesaid; and whenever said company, in addition to the three thousand feet above specified, shall have excavated, in one or more sections, one thousand lineal feet of heading, as above specified, and shall have graded six miles of road in location and otherwise as aforesaid, said six miles of road being all situate within seven miles of the point of commencement at Green River, another portion of said scrip, amounting to eighty thousand dollars, shall be delivered as aforesaid; and when said company, in addition to the grading of six miles of road above specified, shall have excavated four thousand feet