'Upwards of twenty years ago,' says George Combe, 'I accompanied a member of the bar of Paris, a philosopher and a man of letters, on a visit to the Highlands of Scotland. At Callendar a boy of twelve or thirteen years of age attended as a guide to some interesting spot, and in external appearance he seemed to be in every respect one of the common lads of the village. My Parisian friend entered into conversation with him; asked him if he had been at school, and soon discovered that to a tolerable acquaintance with the Greek and Latin languages, he added a pretty extensive-knowledge of arithmetic and geography, and was then engaged in the study of mathematics. My friend conceived that the boy was an average specimen of the peasantry of the country; and greatly admired the educational attainments of the Scotch people, which he had previously heard highly extolled. But,' adds Mr. Combe, 'the boy was the natural son of an English officer, who had resided in the neighbourhood, and who, while he ordered him to be reared in the hardy habits of the Scottish Highlanders, had provided ample funds for his mental education.'* * Intro, to notes on United States of North America, p. 10., vol. 1 It is difficult to believe in this Frenchman being a 'philosopher, making, as he did, a national induction from a single instance. Had he previously inquired, as he ought to have done, the particulars of that lad's life and rearing, before coming to so large a conclusion, he would at once have discovered the error he was falling into. In the Registrar General's Report of 1840, the mean of married persons unable to write is presented. The conclusion is based upon the statistics of nine counties. But when it was found that only three per cent, of the persons marriageable, did marry, the datum was found insufficient to afford sure results. This fact; is given by Mr. Combe in the same book. Then how many boys ought our 'philosopher' to have questioned before making his vast inference? Another instance of the value of a question I extract from the same work. Mr. Combe says:--'A few years ago, when travelling in Somersetshire, I saw four horses, attended by two men, drawing a light plough in a light soil. "What a waste of labour is here," said I to an intelligent farmer; "in Scotland, two horses and one man will accomplish this work." "We rear and train young horses for the London market," said he; "two of the four which you see are serving an apprenticeship to labour."' Had Mr. Combe asked a few questions as to the correctness of his assumed inference, he would have been saved from his erroneous conclusion. We should be wary of unquestioned data.