Section 21 - Conveyance of strips of abandoned canal lands and Onondaga salt springs reservation landa. The commissioner of general services is authorized, in his discretion, to sell and convey at public or private sale, upon such terms and conditions as he may deem proper, all the right, title and interest of the state in and to certain strips of abandoned canal lands or Onondaga salt springs reservation land, which strips adjoin the old beds of the Erie canal and Oswego canal and side-cut canals, which beds were heretofore conveyed by the people of the state of New York and in which said strips of land there remains a right, title or interest in the people of the state of New York. Any such private sale, if made, shall be to the state's grantee or to the successor to the title or interest of the beds so previously granted by the state and shall be for a consideration not less than the appraised value of the said right, title or interest.b. The commissioner of general services is authorized, in his discretion, to sell and convey at private sale, upon such terms and conditions as he may deem proper, all the right, title and interest of the state in and to any parcel of land of the Onondaga salt springs reservation to the person or persons having a deed of record of such land, or their successors in interest, since the first day of January, eighteen hundred ninety-nine, or to any person or persons who have been in continuous, open, notorious and adverse possession of such land since the first day of January, eighteen hundred ninety-nine.