14Westropp, Thomas Johnson. "Notes on the Antiquities of Ardmore." The Journal of the Royal Society of Antiquaries of Ireland 33.4 (1903): 375.
Another author give more latitude to his imagination regarding the potential usages of the bullauns: "The libations that were poured out were of various kinds, milk and wine, or oil and wine, which were merely symbolical representations of blood and fat." (Ffrench, J. F. M. Prehistoric Faith and Worship: Glimpses of Ancient Irish Life. London: D. Nutt, 1912. 9-11.) This may be read here.