(I) A home-made notebook of Morris Davies of Bangor (1796-1876), author, hymnologist and musician, containing material towards a biography of the Reverend Peter Williams (1723-96) and draft resolutions of a committee of Tabernacle Calvinistic Methodist Church, Bangor, 1851-2 (with a reference to the proposed erection of 'Capel Upper Bangor' i.e. Twr-gwyn Chapel). The volume is made up of a variety of printed and manuscript sheets, including an undated printed appeal for subscriptions towards the presentation of his own portrait to Ebenezer Thomas ('Eben Fardd'), an undated printed prospectus of E. Williams, milliner and dress maker, High Street, Bangor; a notice of a meeting of the Provisional Directors of the Rhiw Bach Slate Quarries Company, 1853; a letter from the Reverend John Hughes, Liverpool to M[orris] Davies, 1848 (enclosing books, the possible re-publication of a book of hymns); a printed prospectus of Samuel Roberts, Bangor Agency, China Tea Company, 1852; a letter from Ebenezer M. Roberts, Pwllheli to [Morris Davies], 1853 (the debt still remaining on Penymount Chapel) (with a draft reply); a printed prospectus of [J.] Russell's Menai Bathing Machines, Gored-y-Gyd, Bangor, 1853; and letters from Morris Davies to [ ], undated (an appointment), Croxon, Jones, C[o.], [bankers], Oswestry to John Jones, currier, Llanfyllin, 1838 (a payment), and Thomas Gee, Denbigh to [Morris Davies], 1850 (an allocation to the recipient from the proceeds of Y Traethodydd for 1849). (Ii) A small notebook containing a copy of a letter written in response to a letter published in Y Gwyliedydd, XI (1834), pp. 296-8, relating to the Reverend Peter Williams.

Mae'r fonds yn cynnwys cofnodion gweinyddol, 1866-1989, gan gynnwys cofrestri'r capel, 1866-1974, a chofnodion pwyllgorau amrywiol, 1891-1971; cofnodion ariannol, 1856-2000; hanes yr achos a'r capel, 1935-1975; a phapurau amrywiol, 1897-1999.

Cofnodion Capel Maesgeirchen, Bangor, gan gynnwys llyfr tocyn aelodaeth, 1974-1994, cyfrol o gyfrifon ariannol, 1990-1997, a phapurau gweinyddol amrywiol yn cynnwys cyfrifon a phapurau ariannol, llythyrau ariannol a llythyrau i'r aelodau, adroddiadau blynyddol, cyfriflenni, tystysgrifau heb eu llenwi, a gohebiaeth gyda'r henaduriaeth, 1990-2000.