3'^ Chnmaie of Irett.^Meirkal Syjem. 



It follows, therefore, from the experiments, D and E, that the chromate of iron is com- 

 pofed of 



Chromic acid > • . . . . 318 



Oxide of iron - - - - - - i8o 



Loft 



Which gives for 100 parts. 



498 



2 

 500 



Chromic acid ..__-. 6^, 6 

 Oxide of iron - - - - - - 36, o 



Loft 



o, 4 



100, o 

 The chromate of iron is likewife decompofed by the faturate carbonate of potafh. 



XI. 



Report made to the National Infiitute of Sciences and Arts (at Paris J^ on the l()th Prairialj 

 in thefeventh fear (June 17, 1799), in the Name of the Clafs of Phyfual and Mathema- 

 tical Sciences, en the Meajure of the Meridian of France, and the Refults which have 

 been deduced to determine the new Metrical Syjiem.* 



Citizens, 



O employ, as the fundamental unity of all meafures, a type taken from nature itfeif— a 

 type as unchangeable as the globe on which we dwell ; to propofe a metrical fyftem, of which 

 all the parts are intimately connected together, and of which the multiples and fubdivifions 

 follow a natural progreffion, which is fimple, eafy to comprehend, and in every cafe uniform : 

 diis is moft afTuredly a beautiful, great, and fublime idea, worthy of the enlightened age in 



• Two fcparate reports were read to the clafs of phyfical and mathematical fciences, in the name of the 

 eommiflion of weights and meafures; one on the 6th Prairial, by Citizen Van Swinden, on the meafure of 

 the meridian, and the determination of the metre; the other, on the nth of the fame month, by Citizen 

 Tralles, on the unity of weight. It was decided by the clafs, that thefe two reports fcould be united and 

 digefted into one, t« be read at a general fitting of the Inftitute ; and one of its members was accordingly 

 •harged with this office. It was performed by Citizen Van Swinden. — Note of the reporter. 



I have tranflated the above from the Journal de Phyfique, Thermidor, aa. y ; and to avoid the probability 

 •f any error of the prefs in the numerical refults, I have compared them with the fame in the bulletin of the 

 Thilomathic Society, and the Decade Philofophique, with which I find they agree.— N. 



whiciv 



