liOMSt^fATIOTfS OF OllMt^tllATic 4ikS Aitt OXIGEIC* g£5 



From the ][)roportions whicli I have given in the last Component 



Bakerian lecture, but which were calculated from the ana- partsof the 



. . earthy zDurt* 



lyses of sulphates, it follows, that, if the muriate of baryta, ate&» 



strontia, and lime, be regarded as containing one proportion 

 of oxi muriatic gas, and one of tnetal, then they would con- 

 sist of 71* barium, 46 strontium, and 21 calcium, to 32*9 

 of oxi muriatic gas. 



To determine how far these numbers are accurate, 50 

 grains of each of these muriates, that had been heated to 

 whiteness, were decomposed by nitrate of silver, the preci- 

 pitate was collected, washed, heated, and weighed. 



The muriate of baryta, treated in this way, afforded 68 

 grains of horn-silver. 



The muriate of strontia 85 grains. 



The muriate of lime 125 grains. 



From experiments to be detailed in the next section, it Horn silver, 

 appears^ that horn-silver consists of 12 of silver to 3*9 of 

 oximuriatic gas, and consequently, that barium should be 

 represented by QS'l, strontium by 46-1, and calcium by 

 50-8. 



4. On the Combinations of the Common MetaU with Oxigen 



and Oximuriatic Gas. 



In the limits which it is usual to adopt in this lecture, it Combinations 



will not be possible for me to eive more than an outline of **^ °^'.'^""**^' ^ 

 , • 1. T 1 1 1 , . ^^5 with mo. ? 



the numerous expeniuents, that 1 have mt^de on the combi- tals. 



nationsof oximuriatic gas with metals; I must confine my- • 

 self to a general stateme»t ofthemodeof operu in^- a d the 

 results. I used in all cases small retorts of green glass. 



containing from 3 to (i cubical inches, furnished with stop- J?.^^!iBI^ 

 cocks. The metallic substances were introduced, the riN ' ' 



tort exhausted and filled with the g»s to be a ed u oon, heat 

 was applied by means of a spirit lamp, and after cooling, the 

 results were examined, and the residual gas analysed. 



All the metals that I tried, except silvei, 1 ^d, nickel, MetaU l^tiA 

 cobalt, and gold, when heated, burnt in the oximuriatic ''^ ^'* \ 



gas, and the volatile metals w th fla ac. Ar.ei,.c .^mi- 



* If Mr. James Thomp8on*g analysis of sulphate of baryles be znadf 

 the basis of Calculation, sulphuric acid being estimated as 30, then the 

 number representhig barium will be abuut 05 5. 



Vol, XXIX,— Juir, 1811. Q mony> 



k 



