224 Scientific Intelligence. [March, 



determine these coefficients so that integrable expressions may 

 be obtained. By this means a general result is obtained, which 

 produces the theorem relative to the motion of the centre of 

 gravity, that of the areas, that of the vis viva, and, lastly, the 

 one which the author has demonstrated." 



" The researches which tend to bring general mechanics to 

 perfection are interesting not only to the arts, but also to the 

 study of nature. It is upon these accounts that the Committee 

 judge the work of M. Binet worthy of the approbation of the 

 Academy ; as well for the choice of the subject, as for the man- 

 ner in which the subject is treated ; and propose the printing of 

 the memoir in the collection of foreign papers." 



(To be continued.) 



Article IX. 



SeiENTIFIC INTELLIGENCE, AND NOTICES OF SUBJECTS 

 CONNECTED WITH SCIENCE. 



I. Protoxide and Deutoxide of Azote. 



It seems to have been proved in a satisfactory manner by Gay- 

 Lussac, that deutoxide of azote or nitrous gas is a compound of 

 1 volume of oxygen gas + 1 volume of azotic gas united toge- 

 ther without any change of bulk ; so that the specific gravity of 

 deutoxide of azote must be the mean of that of oxygen gas and 

 that of azotic gas. 



Specific gravity of oxygen gas Mill 



Specific gravity of azotic gas 0-9722 



2)2-0833 



Specificgravityof deutoxide of azote = 1-0416 



A set of careful experiments made in my laboratory gave 1*043 

 as the specific gravity of this gas. Now this comes within -j-^'-g^^th 

 part of the theoretical number — a coincidence which I consider 

 as sufficiently near to satisfy us of the truth of Gay-Lussac'a 

 hypothesis. 



From the most careful experiments hitherto made upon the 

 protoxide of azote, there is reason to consider it as composed of 

 one volume of azotic gas, and half a volume of oxygen gas, con- 

 densed into one volume ; for this gas is completely decomposed 

 when mixed with its own volume of hydrogen gas, and an elec- 

 trical spark passed through the mixture. There remains after 

 tlie combustion a quantity of azotic gas exactly equal to the 

 original bulk of the protoxide of azote employed* Let the? 

 Toluraes of the two gases burned be as follows ; 



