TWO:Amongst the foremost of the promoters of science, and the most eloquent of its expounders, was Sir David Brewster, who died full of years and of honours in 1868. Arrived at manhood at the opening of the present century, having been born in 1781, he continued his brilliant course during fifty years, pursuing his investigations into the laws of polarisation by crystals, and by the reflection, refraction, and absorption of light, in which he made important discoveries. The attention of the British public was forcibly arrested by an able treatise on "Light," contributed by Sir John Herschel, in 1827, to the "Encyclop?dia Metropolitana." Its excellent method and lucid explanations attracted to the theory of Young and Fresnel men of science who had been deterred by the fragmentary and abstruse style of the former. This was followed four years later by a most able and precise mathematical exposition of the theory, and its application to optical problems, by Professor Airy, who became Astronomer-Royal in 1835.But there was no time for festivities. The English army was approaching, and it was necessary for Charles to assert his right by hard blows as well as by proclamations. The citizens stood aloof from his standard; but Lord Nairn arrived most opportunely from the Highlands with five[96] hundred of the clan Maclachlan, headed by their chief, and accompanied by a number of men from Athol. These swelled his little army to upwards of two thousand five hundred, and Charles declared that he would immediately lead them against Cope. The chiefs applauded this resolution, and on the morning of the 19th he marched out to Duddingston, where the troops lay upon their arms, and then he summoned a council of war. He proposed to continue the march the next morning, and meet Cope upon the way. In the highest spirits the clans marched on through Musselburgh and over the heights at Carberry, where Mary Queen of Scots made her last unfortunate fight, nor did they stop till they came in sight of the English army.
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