The appearance of this temporary star in the Andromeda nebula seems to afford further evidence against the hypothesis of the nebula being an external universe. For, as I have shown above, our sun, if placed at a distance of 150,000 light years, would shine only as a star of the 23rd magnitude, or over 15 magnitudes fainter than the temporary star. This would imply that the star shone with a brightness of over a million times that of the sun, and would therefore indicate a body of enormous size. But the rapid fading of its light would, on the contrary, imply a body of comparatively small dimensions. We must, therefore, conclude that the nebula, whatever it may be, is not an external universe, but forms a member of our own sidereal system. In Sir John Herschel's catalogue of Nebulæ and Clusters of Stars, published in 1833, in the _Philosophical Transactions_ of the Royal Society, there are many curious objects mentioned. Of these I have selected the following:-- No. 496 is described as "a superb cluster which fills the whole field; stars 9, 10 ... 13 magnitude and none below, but the whole ground of the sky on which it stands is singularly dotted over with infinitely minute points." This is No. 22 of Sir William Herschel's 6th class, and will be found about 3 degrees south and a little east of the triple star 29 Monocerotis. No. 650. This object lies about 3 degrees north of the star μ Leonis, the most northern of the bright stars in the well-known "Sickle," and is thus described by Sir John Herschel: "A star 12th magnitude with an extremely faint nebulous atmosphere about 10" to 12". It is between a star 8-9 magnitude north preceding, and one 10th magnitude south following, neither of which are so affected. A curious object." No. 1558. Messier 53. A little north-east of the star α Comæ Berenices. Described as "a most beautiful highly compressed cluster. Stars very small, 12th ... 20th magnitude, with scattered stars to a considerable distance; irregularly round, but not globular. Comes up to a blaze in the centre; indicating a round mass of pretty equable density. Extremely compressed. A most beautiful object. A mass of close-wedged stars 5' in diameter; a few 12th magnitude, the rest of the smallest size and innumerable." Webb says, "Not very bright with 3-7/10 inches; beautiful with 9 inches." This should be a magnificent object with a very large telescope, like the Lick or Yerkes. No. 2018. "A more than usually condensed portion of the enormous cluster of the Milky Way. The field has 200 or 300 stars in it at once." This lies about 2° south-west of the star 6 Aquilæ, which is near the northern edge of the bright spot of Milky Way light in "Sobieski's Shield"--one of the brightest spots in the sky.