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A R T. III. Nouveaux Memoirs de l'Academie des Sciences et Pelles Lettres de Berlin. Anneé 1778. 4to. Printed at Berlin.

HISTORY OF THE ACA DEMY.

HIS volume begins with the Eulogy of Voltaire; of which we gave an account in a former Reviews”, with the respećt that was due to its royal Author, and the freedom which is an inviolable privilege in the republic of letters. The other articles, worthy of notice in the historical part of this volume, are as follows:–Observation of a total Eclipse of the Sun, made june 24th, 1778. By Don ANTONIO d’ULLOA.—A Description of the Uranometer, an Instrument, newly invented, which produces an Effect equal to that of a quadrant of a radius of sixty foot. By M. SILBERscHL AG. The construction of this curious instrument would be scarcely intelligible, without the plates, which the Author has here subjoined to his description of it. To these he has added the solutions of some important problems, to shew with what facility and accuracy the most difficult astronomical operations may be performed by means of this instrument.—Observation of a particular Variation #. the Barometer. By M. ToALDo, Professor of Astronomy at adua.-Natural philosophers are generally agreed, that the action of the moon produces, in our atmosphere, tides analogous to those of the ocean, but have denied that the effect of such an alteration in the weight of the air, as these tides must occasion, can be observed in the barometer. Of this number is the celebrated Abbé Frisi, as appears by his learned Treatises de Gravitate et de Cosmographia. The acute Philosopher who now addresses us, having calculated this alteration of the weight of the air, and having found it equivalent to ris of a line in the barometer when produced by the action of the sun, and to or when produced by that of the moon, concluded that this vari

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* Wid. Rev. Vol. lx. p. 67 and 144.
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