Section 59. The state treasurer, in addition to the provisions contained in section two of chapter ten, shall be liable on the treasurer’s bond for the faithful performance of his duties in connection with the unemployment compensation fund, the clearing account in connection therewith and the employment security administration account provided for under this chapter. Such liability of the treasurer on his official bond shall be effective immediately upon the enactment of this provision, and such liability shall exist in addition to any liability upon any separate bond existent on the effective date of this provision.