Section 238. Increased deposit, when and how required

In case any of the
  securities deposited in lieu of money as provided in section two hundred
  and twenty-five, shall in the opinion of the county treasurer  or  trust
  company  with  whom they may be deposited, fall below their actual value
  at the time of deposit, the county treasurer or trust company shall call
  upon such railroad corporation to substitute therefor  other  securities
  equivalent  at  their par or market value to the amount in lieu of which
  the securities for which they are to be substituted were deposited,  and
  in  case  such  other  securities  shall  not  be  furnished, the county
  treasurer or trust company shall call upon such corporation  to  furnish
  as a substitute, and it shall so furnish an amount of money equal to the
  amount  in  lieu  of  which  the securities first above referred to were
  deposited.