School lands taxable when leased

All school lands known as the sixteenth sections, reserved for the use of schools, or lands reserved or granted in lieu of or as a substitute for the sixteenth sections, shall be liable, after the same shall have been leased, to be taxed as other lands are taxed during the continuance of the lease; but in case of sale thereof for taxes, only the title of the lessee or his assignee shall pass by the sale.