22 Mr, Davy’s Experiments on the 
of oxymuriatic gas, and one of metal, then they would con- 
sist of 71* barium, 4 6 strontium, and 21 calcium, to 32.9 of 
oxymuriatic 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 precipitate was col- 
lected, 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 ap- 
pears that horn-silver consists of 12 of silver to 3.9 of oxy- 
muriatic gas, and consequently that barium should be repre- 
sented by 65. 1, strontium by 46.1, and calcium by 20.8. 
4. On the Combinations of the Common Metals , with Oxygene 
and Oxymuriatic Gas. 
In the limits which it is usual to adopt in this lecture, it will 
not be possible for me to give more than an outline of the 
numerous experiments that I have made on the combinations 
of oxymuriatic gas with metals ; I must confine myself to a 
general statement of the mode of operating, and the results. 
I used in all cases small retorts of green glass, containing 
from 3 to 6 cubical inches, furnished with stopcocks. The 
metallic substances were introduced, the retort exhausted and 
filled with the gas to be acted upon, heat was applied by 
* If Mr. James Thompson’s analysis of sulphate of barytes be made the basis of 
calculation, sulphuric acid being estimated as 36, then the number representing 
barium will be about 65.5, 
