1*54 Scientific Intelligence. [Aug. 



will complete two treatises which the author has already given in 

 geodesy. 



On a System of Analytical Formulas. By M. Binet. 



On. Symmetrical Functions. By M. Gauchy. 



On the Means of determining the Number and the Signs of the 

 real Roots of Algebraic Equations. By the same. 



These memoirs, of which this is not the place to give an extract, 

 have heen approved by the Class, and will appear among those of 

 the Savans Etrangers. 



Memoirs relative to the Reality and to the Signs of the Roots of 

 Equations. By M. du Bourguet 



This memoir has been approved, and the author invited to sim- 

 plify some of the considerations which he employs, and to apply 

 them to higher degrees of equations. 



Memoir of M. Duvillard on the Theory of Population. Des- 

 tined likewise to appear in the collection of the Savant Etrangers. 



On. Mills put in Motion by the Reaction of Water, and on a 

 Hydraulic Machine. By M. Manoury d' Ectot. 



These mills, from their simplicity and utility, seem often entitled 

 to be preferred to the ordinary mills. As for the machine, the 

 Cla^s was of opinion, as well as the commissioners, that from its 

 extreme simplicity it ought to be ranked among the most interest- 

 ing conceptions for the arts. 



On the Curvature of Surfaces, 4th and 5th Memoirs. By M. 

 Dupin. 



On the Experiments to determine the Force, the Flexibility, and 

 the Elasticity of Wood. By the same. 



These two memoirs have been considered as deserving a place in 

 the collection of the Savans Etrangers. The third, which the 

 author has not yet been able to complete, has, notwithstanding, 

 merited the praises and encouragements of the Class. The author, 

 captain in the first corps of marine engineers, foreign associate of 

 the Institute of Naples, has presented to the Class a printed work, 

 entitled, Derelopements in Geometry, with applications to the sta- 

 bility of vessels, to loading and unloading, to optics, the manu- 

 script of which, in 1812, had obtained the approbation of the 

 Class of sciences, and of which we spoke in our last year's analysis. 



(To bt continued.) 



Article XVI. 

 SCIENTIFIC intelligence; and notices of subjects 



CONNECTED WITH SCIENCE. 



I. Chinese Lead. 

 Having occasion some time ago for some nitrate of lead, and 



