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picture has been painted with careful attention to all that is known, or can be conjectured, of the circumstances.

Page 84.—Appley Bridge Aerolite. Reproduced by kind permission of the Royal Astronomical Society from Monthly Notices, Vol. LXXV. p. 94. The aerolite fell on Oct. 13, 1914 (after the lectures were given). Its length was 9.65 in., depth 9.13, and width 6.62 ins. It ranks as the second largest recorded fall in Great Britain.

Page 93.—W. Herschel's 20-foot telescope. My thanks are due to the Herschel family for permission to reproduce this illustration. It appears as Plate B in Vol. I. of the recently published Collected Papers, and is described as "from a Drawing made either at Datchet or at Clay Hall."

Page 97.—"The Great Five-foot being taken up Mount Wilson," and p. 98, "An Accident to the Traffic up Mount Wilson," are due to the courtesy of Professor Hale. The latter represents the only serious accident attending the whole of the extended series of transport operations. Two of the men jumped from the car as it was slipping over the track, but the driver stuck to his car and went down with it. Mr. Adams, dashing down the steep incline, found him badly cut and bruised; but with ropes he was hauled up and taken to hospital.

Page 114.—Great Nebula in Andromeda. This picture is taken by kind permission of the Royal Astronomical Society from No. 98 of their series. It is from a photograph taken by G. W. Ritchey and F. G. Pease at the Yerkes Observatory on Sept. 18, 1901, with a colour screen on the 40-in. refractor.

Page 116.—Victoria Telescope. This record of an incident of the erection of the telescope I owe to the kindness of the late Sir David Gill.

Page 119.—A coelostat at Oxford. The coelostat was invented many years ago by a Frenchman named August. It was, however, not much used. In 1896 Dr. Johnstone Stoney directed attention to a paper by the great French physicist Lippmann, in which he recalled the principle. It was at once seen that the instrument was specially suitable for eclipse work, and a pair of coelostats were constructed under the direction of Dr. Common for the 1896 eclipse. The picture shows one of these being mounted in the garden of the University Observatory at Oxford, in order to test