70 Mr. Faraday on two new compounds 
hot pure baryta in a glass tube : a very brilliant combustion 
with flame took place, chloride of barium and carbonic acid 
were produced, and a little charcoal deposited. When the tube 
was cold, the barytes was dissolved in nitric acid, and the 
chlorine precipitated by nitrate of silver, 9. 4 grains of dry 
chloride of silver were obtained = 2.32 grains of chlorine. 
Other experiments were made with lime, which gave 
results very near to this, the quantity of chloride being ra- 
ther less. 
3 grains of pure proto-chloride were passed over per- 
oxide of copper heated red hot in an iron tube, and the gas 
received over mercury. 3.5 cubic inches of carbonic acid gas 
came over mixed with ,1 of a cubic inch of common air. 
These 3.5 cubic inches are nearly equal to .449 of a grain of 
carbon. 
These experiments indicate the composition of the fluid 
chloride of carbon to be 1 proportion of chlorine and 1 of 
carbon, or 33.5 of the former and 5.7 of the latter. The dif- 
ference between these theoretical numbers, and the results 
of the experiments, is not too great to have arisen from errors 
in working on such small quantities of the substance. 
A mixture of equal volumes of oxygen and hydrogen was 
made, and 2 volumes of it detonated with the vapour of the 
proto-chloride in excess over mercury by the electric spark. 
The expansion was very nearly to 4 volumes ; of these, 2 
were muriatic acid, and the rest pure carbonic oxide . and 
calomel had been formed, its presence being ascertained 
by potash. Hence it appears, that 1 volume of hydrogen 
and half a volume of oxygen had decomposed 1 proportion 
of the proto-chloride, forming the two volumes of muriatic 
