COMMEMORATION, ENCZENIA

annual celebration at Oxford, marking completion of degrees, presentation of honorary distinctions, recitation of prize — e ays, etc.; usually held on third Wednesday after Trinity Sunday. indicating the dwelling together of organisms of different species; good example is anemone, which affixes itself to the acquired shell of the hermit-crab, and defends it by stinging-threads in return for the current-producing powers of hermit-crab, which enable it to obtain its food; ¢ occurs also in bivalves; frequently develops into parasitism. surabilis). Two magnitudes are called — ‘commensurable’ when they are of the same kind and each contain a third magnitude exactly, examples being a foot and a yard, or the numbers 14 and 21. If no unit or common measure can be found, the magnitudes are ‘incommensurable,’ examples being the diameter and the circumference of a circle, and in arithmetic numbers which are prime to one another, as 17 and 23.