Search the pre-1837 index from this form. There is no index available for post-1837, but you can request a box for the required year on the Catalogue.
The marriage bonds enabled a marriage licence to be issued without having to proclaim banns in church on three successive Sundays prior to the marriage. The bonds give interesting details about the two parties including names, dates, location, age and the groom's profession. Only the marriage bonds and affidavits to 1837 have been indexed, but later records are available well in to the 20th century.