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MOON CULMINATIONS,

Observed at Cambridge Observatory, corrected for Collimation, Level, and Azimuthal Deviations of the Transit Instrument, and for Clock Rate and Error on Sidereal Time.

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9 33 00.85 01.00 +0.15
9 37 11.64 11.53
10 00 15.22 15.21-0.01
15 58 22.74

16 06 20.51 20.47-0.04
16 20 02.70 02.77 -0.07
4 11 06.74 06.38-0.36
4 27 10.02 10.01-0.01
4 53 58.65 58.58 -0.07
5 05 25.72 25.58 -0.14
5 28 31.85 31.67 -0.18
5 45 21.87

6 05 40.13 40.35+0.22
6 13 43.83 43.99 0.16
5 05 25.52 25.55 +0.03
5 07 12.30 12.36 0.06
5 16 38.91 38.98

5 24 12.68 12.76

5 28 28.30 28.39 +0.09
6 05 40.01 40.33+0.32
6 13 44.12 43.96 0.16
6 39 42.76

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11 05 59.90 59.89-0.01 B2
11 13 16.67 17.02 +0.35
11 20 06.03 06.33+0.30
11 35 27.44

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Mr. Everett read a short paper on the number of primary planets belonging to our system which might be supposed to remain as yet undiscovered.

He stated that he had been " led more particularly to the inquiry by the striking remark of M. Leverrier (in the Compte Rendu for 5th October, 1846, p. 659) to this effect, that we may hope that, after thirty or forty years of observations of the new planet, we shall be able to use it, in its turn, for the discovery of that which follows it, in the order of distances from the sun. And so on. Unhappily we shall soon fall upon stars, invisible in consequence of their immense distance from the sun, but whose orbits eventually, in the lapse of ages, will be traced with great exactness by means of the theory of secular inequalities.' All calculations of this kind must, of course, take for granted that the law of gravitation exists and operates in the remote parts of the system as it does within the reach of our observations. The star 61 Cygni is usually regarded as the fixed star nearest to us, and this is placed by Bessel at the distance of 62,481,500,000,000 miles. Adopting the only supposition that we are able to make on this subject, viz., that our sun and the stars are bodies of equal size and density, we may conclude that the attraction of the sun extends over half the interval between the sun and 61 Cygni, that is, over a space of 31,240,750,000,000 miles. The law of the distances from the sun at which the planets succeed each other in our system is not known; but assuming Bode's law, or, still more simply, a geometrical progression, as that which comes near the truth in reference to all the known planets except the last discovered (regarding the asteroids as one planetary system), and we should have room for ten new planets, and nearly the eleventh, outside the orbit of Neptune."

Mr. Everett also read a letter from Professor Owen, of London, containing an approving notice of Dr. Meigs's paper on the generation of the opossum, and expressing a strong desire to receive, in behalf of the Hunterian Museum, specimens of the impregnated uterus of this animal, preserved in spirits.

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"Female opossums killed between the 18th of February and the 6th of March would be likely to afford such specimens, of which not one exists in the museums of London, nor, I believe, in Europe. The value of the specimen would be enhanced, if any of your young anat

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