OCCULTAT10NS OF STARS BY JUPITER'S SATELLITES. —Mr. Tebbutt, of Windsor, N.S.W., writes to the Astro-nomische Nachrichten, that on October 5 he made “an observation, which, if not without a parallel in the annals of astronomy, is at least an extremely rare one.”A star of the ninth magnitude was occulted by the first satellite of Jupiter, under sufficiently good definition to allow of the latter being seen with a round disk: the occultation was not quite central, the star appearing to pass behind the northern portion of the disk. From the approximate position assigned to the star by Mr. Tebbutt, it must have been No. 20236 of Oeltzen's Argelander, called 9.10 mag.