C 3 
XIII. Additional Experiments on the Muriatic and Oxy muriatic 
Acids. By William Henry, M. D. F. R. S. V. P. of the Lit. 
and Phil . Society , and Physician to the Inf.rmary t at Man- 
chester . 
Read March 19, 1812. 
J h e experiments, which form the subject of the following 
pages, are intended as supplementary to a more extensive 
series, which the Royal Society did me the honour to insert in 
their Transactions for the year 1800.* Of the general accu- 
racy of those experiments, I have since had no reason to 
doubt ; and their results, indeed, are coincident w ; ith those of 
subsequent writers of the highest authority in chemistry. My 
attention has been again drawn to the subject by the impor- 
tant controversy which has lately been carried on between Mr. 
Murray and Mr. John Davy, respecting the nature of mu- 
riatic and oxymuriatic acids ;-f and I have been induced, by 
some hints which the discussion has suggested, not only to 
repeat the principal experiments described in my memoir, but 
to institute others, with the advantage of a more perfect appa- 
ratus than I then possessed, and of greater experience in the 
management of these delicate processes. 
This repetition of my former labours has discovered to me 
an instance, in which I have failed in drawing the proper con- 
clusion from facts. In two comparative experiments on the 
electrization of equal quantities of muriatic acid gas, the one 
* Page 188. f Nicholson’s Journal, xxviii. and xxix. 
