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THREE: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.

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THREE:Such were the advantages now possessed by the British over the French commander, that both the Portuguese and people at home were impatient that Wellington should at once attack and annihilate Massena's army. But Wellington knew better. He knew that a great battle, or battles, must vastly reduce his own as well as Massena's army. He knew that France could readily march down eighty or a hundred thousand fresh men into Portugal at extremity, but that Great Britain could not so readily do that; and, should the Whigs come into power, as was probable, he could not calculate on any support at all. The king now hopelessly insane, the Prince of Wales must be soon appointed Regent, and then, perhaps, would come in his friends the Whigs. There were many other considerations which made Wellington refuse to accede to a general attack on the French at present. He had, as it was, trouble enough with the Junta; but, should any reverse occur, his situation then would be intolerable. Just now the Portuguese troops were in good spirits for fighting, but defeat would ruin all the progress yet made with them. He knew that the winter would do for the French army all that he expected without any cost to himself, and he waited for that, ready then to follow up the advantages it would give him. It was his great plan of operations which already reduced them to the dilemma in which they were, and now came winter and did the rest, fully showing his superior sagacity. In November the weather became and continued wretched in the extreme. The country was flooded, cutting off the precarious supplies of the French, but adding strength to the encampment of Torres Vedras. The cross roads were impassable for artillery, and all but impassable for waggons bringing provisions, which had to be hunted for far and wide, with incredible hardships and little success. Leaving the hostile armies in this position till the spring, we must notice other important matters.

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