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diameter is 6 in. The date of the observations is Dec. 4, 1906, and the interval between the sketches is 1½ hours.

Page 151.—Saturn. The three photographs are from a longer series kindly sent me by Professor E. E. Barnard, taken by him with the 6o-in. reflector on Mount Wilson (Cal.), Nov. 19, 1911.

Page 163.—Leverrier Statue. From the memorial volume to Leverrier, published by the Institut de France, on the centenary of his birth (March 12, 1811). The statue by Chapu was erected in 1889 in the Cour du Nord of the Paris Observatory.

Page 164.—Plaque of Adams is reproduced from a photograph taken in Westminster Abbey by Mr. Wright.

Page 185.—By kind permission of the publisher, Mr. John Murray.

Page 189.—Liquid Air Experiment. Reproduced from the Illustrated London News of Jan. 10, 1914, by kind permission of the Editor.

Page 195.—Sun as taken at Greenwich. One of a series kindly supplied for lecture purposes by the Astronomer Royal.

Page 205.—Collision of Saturn and Leonids. Reproduced from the Illustrated London News of Dec. 20, 1913, by kind permission of the Editor.

Page 212.—Drawing by Huggins. Reproduced by kind permission of the Royal Astronomical Society from Monthly Notices, Vol. XXVI. , p. 263.

Page 213.—Drawing by Nasmyth. The original drawing was presented by the artist to the Oxford University Observatory, where it now hangs.

Page 215.—Hansky's photographs, from Mitteilungen der Nikolai-Hauptsternwarte zu Pulkowo, Band, I. No. 6.

Page 218 and 220.—Figs. 62, 63 and 65-70 are again due to the courtesy of Professor Hale. They may be found in the Astrophysical Journal, Vol. XIX. and Vol. XXVIII.

Page 237.—The Japanese eclipse. The 1896 expeditions, for which the coelostats were prepared (see note above to p. 119), went one to Norway and one to Japan; but both had cloudy weather at the critical moment. A Japanese artist accompanied the latter expedition from Tokio to its observing station, and was to have painted