In six dialogues: the sixth contains a quadrature of the circle. But there is another edition of this work, without place or date on the title-page, in which the quadrature is omitted. This seems to be connected with the publication of another quadrature, without date, but about 1670, as may be judged from its professing to answer a tract of Wallis, printed in 1669. The title is Quadratura circuli, cubatio sphæræ, duplicatio cubi, 4to. Hobbes, who began in 1655, was very wrong in his quadrature; but, though not a Gregory St. Vincent, he was not the ignoramus in geometry that he is sometimes supposed.

Five meetings of the International Statistical Congress have now been held, and it cannot be denied, that, with the vast increase in commerce, and in the social relations of different countries, they continue to grow in interest and importance. The first Congress, which may be truly said to owe its origin to the exertions of, and was presided over by, that eminent writer and thinker, M. Quetelet, was held in Brussels, in 1853; the second in Paris, in 1855 ; the third in Vienna, in 1857; the fourth in London, in 1860.

Some years ago, before the enactment of the Ten Hours Factory Bill, I had the honour to be engaged by the Earl of Shaftesbury (then Lord Ashley) on an investigation of the average distances traversed daily by children and others employed as “piecers” in the cotton mills about Manchester and the surrounding districts. After taking the various dimensions of the mules or spinningjennies, and making the requisite observations as to the number of strokes of each machine per minute, and the average number of breakages of the threads at each stroke, I found that the necessary calculation involved a preliminary discussion of a somewhat curious mathematical problem.