we should find the pea approaching nearer and nearer, and perhaps even passing the line through the orange and pin. These relative motions we can see will continue until the grain makes nearly one-fourth of a circumference, after which the pea appears to make a movement in exactly the opposite direction. Now the foregoing represents tolerably well the relative positions and movements for this month of the bodies named. The earth, Jupiter and Regulus are on the same side of the sun; the earth nearest, Jupiter next (about five times as far as the earth), and Regulus next (at a distance of say 20,000,000,000,000 miles), and five degrees west of the line joining the earth and Jupiter. (These bodies we know move at the average rate of 18.38 and 8.06 miles per second respectively.) Our standpoint is the earth, and as we move eastwardly so much more rapidly than Jupiter, we find him dropping back each day, and apparently approaching nearer to Regulus, till at the end of the month we find him as before stated, only about 1½° _east_ of that star. Should we watch him through March and April, we should find him retrograding during the former month and twenty-two days of the latter, on the 23d of April being 1½° _west_ of Regulus; and on the same date, as the earth would be going directly away from him, he would appear stationary; and immediately afterward would seem to start again toward the east. Jupiter, as we know, is one of the superior planets, and an explanation of his retrograde motion explains that of all the others of his kind. A little ingenuity, putting the earth for Jupiter and Mercury or Venus for the earth, will show what is meant by the retrograde motion of the inferior planets. SATURN Rises at 12:58 p. m. on the 1st and sets at 3:34 a. m. on the 2d; rises at 11:58 a. m. on the 16th and sets at 2:35 a. m. on the 17th; rises at 11:12 a. m. on the 28th and sets at 1:48 a. m. on March 1st. On the 16th, at 4:00 a. m., stationary; on 23d, at 3:21 a. m., 3° 44´ north of the moon. Diameter diminishes one second. Will be an evening star during the entire month, and thus afford most convenient opportunities for observations. URANUS Has a retrograde motion of 49´ 53´´; diameter, 3.8´´. On the 3d, at 3:25 a. m., is 1° 7´ north of the moon; on the 31st of January it rises at 9:25 p. m. and sets on the 1st at 9:23 a. m.; on the 15th, rises at 8:24 p. m. and sets on the 16th at 8:22 a. m.; rises on the 27th at 7:35 p. m. and sets on the 28th at 7:35 a. m. It is now a little south of the equator, in the constellation _Virgo_, and will remain in that constellation some six years. NEPTUNE