1811.] Imperial Institute* 73 



ditional note in which the author gives new developments of his 

 theory of negative quantities. 



Observations on the great Comet of 1807, with a Supplement to 

 the Aphrodilographic Fragments. By M. Schrceter; Gottingen, 

 181-1. In German. 



The author lias attached himself to the physical consideration of 

 this comet. The objects of his observations are the particular 

 phenomena which it offered, its nucleus, its nebulosity, the varia- 

 tions in its tail, its direction, and its proper light. 



In the new observations of Venus will be remarked the attempts 

 made by the author to determine the time of the rotation of Venus, 

 by phenomena which he observed in the horns of her crescent. 

 By a multitude of calculations and comparisons of which it is imr 

 possible to present the details, he comes to this result. The time 

 of rotation is 2.'i hours 21', 7" 9 77"- This confirms the old determi- 

 nation of Cassini. The author suspects that this planet has a pecu- 

 liar phosphorescent light of its own. He thinks this is the case 

 also with Mercury, and perhaps with all the planets in our system. 



Theory of Analytical Functions', by M. Lagrange. A new edi- 

 tion, revised and augmented by the author. 



This second edition has several advantages over the first edition 

 which appeared in 1 7^7- L ' s more correct; it is better arranged, 

 and is divided into chapters, which was not the case at first, at 

 the work had been originally printed as fast as written. There arc 

 also several additions, the principal of which are in the 11th chapter 

 of the second part, and the fifth chapter of the third part. The 

 author presented it to the Class 'VJ days before his death. 



An Abridgement of Astronomy, by M. Delambre. This work is 

 an abstract of the lectures which the author gave in the Imperial 

 College of France, the complete collection of which in three 

 volumes 4to. will appear early in 1814. It contains all the astro- 

 nomical calculations reduced into formulas, and presented in the 

 order which appeared the most natural. 



The Sixth and last but one Part of Researches on the Monuments 

 of indigenous Inhabitants of tlie New Continent, by JM. de Hum- 

 boldt. 



This part is terminated by a memoir of M. Visconti on the rela- 

 tions which subsist between the American monuments and those of 

 the ancient continent. 



Memoir on several Physical Properties newly discovered in the 

 Mo/i; ah v of Light ; read at the public sitting of 1813, by M. Biot. 



Foftrth edition of the Systeme du Monde; by M. Laplace. 



Description <</ the Harbour near Lindou on the Luke of Con- 

 ttance. — Second Volume of the Construction of Bridges ami other 

 l)n hin, on II hi i, with -to' Plates. These "two works are by M. 

 \\ iebeklng. 



Table* of the Divisors of the Second Million, or man crucify 

 from 1,020,000 to 2,028,000, with the Prime Numbers thai occur 

 a.mong litem. By M. Burckhardlj L'aiis, at .Madame Couicicrs. 



