List of sources:
Cape of Good Hope. Catalogue of the natural history collections of the Albany Museum, Grahamstown (Appendix to Parliamentary Report G24-'83). Cape Town: W.A. Richards & Sons, 1883.
Cape of Good Hope. Report of the committee of the Albany Museum, 1860, 1861, 1864.
Family: Octavius Bouchier Bowker / Mary Anne Stubbs http://1820settlers.com/genealogy/familygroup.php?familyID=F121&tree=master
Hewitt, J. The Albany Museum, Grahamstown. Southern African Museums Association Bulletin, 1947, Vol. 4(4), pp. 81-91.
Mitford-Barberton, I. & Mitford-Barberton, R. The Bowkers of Tharfield. Oxford University Press, 1952.