When a county shall be added to another, all prior indebtedness of each county shall remain a charge on the taxable property within the territory of each county as it existed prior to consolidation. When any part of a county is stricken off and attached to another county, the part stricken off shall be holden for its proportion of all then existing liabilities of the county from which it is taken, but shall not be holden for any then existing liabilities of the county to which it is attached.