OBSERVATIONS OF JUPITER'S FIFTH SATELLITE.—Prof. J. M. Schaeberle, writing from the Lick Observatory to the Astronomical Journal (No. 398), gives the results of his observations relating to the fifth satellite of Jupiter. These measures will furnish considerable data for correcting the mean motion of the satellite, even if no other observations be secured at the present season. Marth's ephemeris was found still to be in good agreement with the observed place, the error in time of elongation being less than four minutes. The observations were made on February 27 of this year, and were begun within half an hour of the satellite's greatest elongation.