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xiv its performance before starting for Japan to observe the eclipse.

120.—The Snow Horizontal Telescope, and p. 122, The High "Tower" Telescope, are from Professor Hale's Annual Reports. One sometimes feels that more than a perfunctory word of thanks is due to the astronomers of the Harvard, Lick, Yerkes, Mount Wilson and other great American observatories for the plentiful supply of beautiful pictures to the world at large.

124.—The ascent in the bucket is from a snapshot taken during the visit of the Solar Union to Mount Wilson in 1910, and kindly sent to me by one of the occupants of the "elevator."

127.—The cities of Pasadena and Los Angeles, from a beautiful print kindly sent me from Mount Wilson the particulars of which have unfortunately been mislaid.

133.—Algol, "An Astronomical Reprobate." This illustration is reproduced by the special permission of the Proprietors of Punch. It is from the number for Jan. 18, 1899. The note under the drawing is as follows: "The star Algol behaved in a most ill-bred manner. He would advance, wink, and then retire. For years his motion and behaviour puzzled astronomers, until at last the mystery was solved by Professor Vogel, who showed that Algol had associated with him a dark star, which was invisible, and that the latter sometimes obscured the former. Algol and his invisible playmate revolved round each other, and this accounted for the fact that Algol seemed to us to wink." Sir Robert Ball's Lecture at the Royal Institution.

138.—Mars, as drawn by N. E. Green, is taken by kind permission of the Royal Astronomical Society from Plate II., Fig. 11, of their Memoirs, Vol. XLIV. It was made by use of a 13-in. reflector by Geo. With, and is dated Sept. 10, 1877, 11 hrs. 20 min; longitude 297°. The original is beautifully tinted, but it has not been possible to reproduce the tinting here.

145.—Mars, with the 40-in. from a print kindly sent me by Professor Barnard. His note on the back is "40-in. direct enlargement, Sept. 28, 1909."

147.—Jupiter, by Mr. Scriven Bolton. This pair of drawings was kindly made specially for this book. The original is a chalk drawing in which Jupiter's equatorial