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the Marienkirche in Lübeck, now restored. Below, at the height of a man’s head, is the plate which shows the day of the week, month, etc.; these calculations are so reliable that the extra day of leap-year is pushed in automatically every four years. The plate is more than three meters in diameter. Above it is the dial, almost as large. The numbers from 1 to 12 are repeated, so that the hour-hand goes around the dial only once in twenty-four hours. In the wide space between the axis which carries the hand and the band where the hours are marked, the fixed stars and the course of the planets are represented. The heavens are here shown as they appear to an observer in Lübeck. In the old works the movement of the planets was given incorrectly, for they all were shown as completing a revolution around the sun in 360 days. Of course this is absurd. Mercury, for example, revolves once around the sun in eighty-eight days, while Saturn requires twenty-nine years and 166 days for one revolution. When this astronomical clock was repaired, some years ago, a very complicated system of wheels had to be devised to reproduce accurately the great difference in the movement of the planets. The work consumed two years. There are a great number of moving figures on the Lübeck clock, but they are not of the most conspicuous interest. In spite of this, however, they excite more wonder among the crowds of tourists who are always present when the clock strikes twelve than the really remarkable and admirable astronomical and calendar works.

THE CLOCK IN THE ST. MARK’'S SQUARE, VENICE.

The Strassburg clock has, more than all others, an actually world-wide fame; and no traveler who visits the beautiful old-city fails to see the curious and interesting spectacle which it offers daily at noontime. To quote from one such visitor: “Long before the clock strikes twelve,a crowd has assembled in the high-arched portico of the stately cathedral, to be sure of not missing the right moment. Men and women of both high and low degree, strangers and townspeople alike,