i sj. 3 .J the Commencement of the Year 1817. Part I. 7 



accurate numbers would be deduced from experiments conducted 

 with but moderate precision. Thus though analysis may not 

 enable us to determine the composition of sulphate of barytes 

 with the utmost possible exactness ; yet if we make 100 careful 

 analyses, and take the mean of the whole, the probability is, that 

 the numbers deduced from such a multitude of careful experi- 

 ments would be almost absolutely correct. 



The present state of the analyses on which the numbers 

 pitched upon to represent the weight of the atoms of bodies 

 depend, is such that every repetition of them demands to be 

 carefully studied. On this account, a set of experiments, which 

 Berzelius has lately published, consisting in a repetition of some 

 of his early experiments on the subject, with every possible 

 attention to accuracy, are particularly valuable. They afforded 

 myself a great deal of gratification ; for most of them approach 

 very nearly indeed to the numbers which I have given in the 

 last edition of my System of Chemistry. Of these, an abstract 

 will be given in a subsequent number of the Annals. 



2. Relation between the Oxidation and the Specijic Gravity of 

 Metals. — M. Frere de Montizon conceives that he has observed 

 a simple relation between the specific gravity and the weight of 

 the oxygen with which a metal unites. This oxygen, according 

 to him, is either a multiple or submultiple of the density. The 

 following table exhibits the evidence upon which this opinion is 

 founded : 



Oxides. 



Protoxide of manganese 



Oxide of zinc 



Protoxide of iron 



Protoxide of tin 



Protoxide of arsenic . . . 

 Protox. of molybdenum 



Tungstic acid 



DeiMoxide of antimony. 

 Deutoxide of cobalt ... 

 Protoxide of uranium. . 



Oxide of bismuth 



Deutoxide of copper , . . 



Oxide of tellurium 



Protoxide of nickel. . . . 

 Protoxide of lead 



Deutoxide of mercury. . 



Oxide of silver 



Oxide of palladium. ... 



Analysers of 

 the Oxides. 



Quantity of Oxygen. 



Deutoxide of gold 

 Deutoxide of platinum . 



Berzelius. 



Gay-Lussac. 



Berzelius. 



Gay-Lussac. 



Berzelius. 



Richter. 



Bucholz. 



Thenard. 



Proust. 



Berzelius. 



Lagerhjelm. 



Berzelius. 



Berzelius. 



Proust. 



Berzelius. 



Thenard. 



Berzelius. 

 Vauquelin. 

 Oberkampf. 

 Berzelius. 



Indicat- 

 ed by 

 Analy- 



By Theory 



in For- in Num- 



sis. mulas. 



28-1050 

 24-41 

 29-5 

 13-6 



8-475 



8-6 



25-0000 

 26-07 



25-5 

 9-4 



11-275 



25-0000 



2483 



250000 



7-73 

 80000 



7-3985 

 250000 



9-820 

 16-380 



Sp. Gra- 

 vity of 



the 

 Metals. 



bers. 



•28-000 

 2501 

 30-4 

 140 



8-308 



8-6 

 25-83 

 26-808 

 25-615 



90 



11-622 

 25-752 

 24-46 

 25-14 



7-568 



7-806 



7-0 



7-1458 

 7-6 

 7-0 

 8-308 



•8-6 



17 22 

 6-7021 

 8-5384 

 90 

 8-7168 

 8-584 

 6 115 

 8-3S0 



11-3523 



Ascertained of 

 these Densities. 



Hijelm. 



Gay-Lussac. 



Musschenbroek. 



Gilbert. 



Bergman. 



Bucholz. 



\llen and Aikin. 



Brisson. 



Tassaert. 



Bucholz. 



Musschenbroek. 



Haiiy. 



Klaproth. 



Tnpputi. 



Brisson. 



15-012 Biddle. 



11091 Musschenbroek. 

 12'0 Vauquelin. 

 19G40 Musschenbroek. 

 20-722 iKlaproth. 



(AnD. de Cliiiu. et Phyi. vii. 7.) 



