After an interval the polarization begins to be incomplete in the perpendicular direction, the light which reaches the eye when the nicol is set to minimum transmission being of a beautiful blue, much richer than anything that can be seen in the earlier stages.
James Nicol (1769-1819), the poet, was minister of Traquair, and his son James Nicol (1810-1879), the geologist and professor of natural history in Aberdeen University, was born in the manse.
When quenched as far as possible by rotation of a nicol prism, it exhibits a residue of a more intense blue colour; and further it is found that the direction of the most nearly complete polarization becomes inclined to the direction of the primary rays.
In the early r6th century the use of the vernacular is extended, chiefly in the treatment of historical and polemical subjects, as in Murdoch Nisbet's version of Purvey (in MS. till 1901), a compromise between northern and southern usage; Gau's (q.v.) Richt Vay, translated from Christiern Pedersen; Bellenden's (q.v.) translation of Livy and Scottish History; the Complaynt of Scotlande, largely a mosaic of translation from the French; Ninian Winzet's (q.v.) Tractates; Lesley's (q.v.) History of Scotland; Knox's (q.v.) History; Buchanan's (q.v.) Chamaeleon; Lindesay of Pitscottie's (q.v.) History; and the tracts of Nicol Burne and other exiled Catholics.