All deeds, mortgages or other instruments which prior to the twentieth day of January, 1893, have been probated by a justice of the peace and ordered to registration by a judge of the superior court or justice of the Supreme Court, to which clerks of the superior court are parties, are hereby confirmed, and the probates and orders for registration declared to be valid. (1893, c. 3, s. 2; Rev., s. 1011; C.S., s. 3342.)