22 Prof. Schinbein on the Allotropic Modifications of Oxygen. 1 
a certain number of oxy-compounds, for instance the peroxyds 
of manganese, lead, nickel, cobalt, bismuth, silver, and also 
permanganic, chromic, and vanadic acids, furnish with muriatic” 
acid chlorine, whilst another set, such as the peroxyds of barium, 
strontium, potassium, &c., are not capable of eliminating chlo- 
rine either out of the said acid or any other chlorid. This’ 
second class of oxy-compounds produces, however, with muriati¢ 
acid, the peroxyd of hydrogen; and it is quite impossible in any 
way to obtain from the first class of the peroxyds HO?, or from 
the second chlorine. , 
You are aware that, from reasons of analogy, I do not believe 
=Mu0+(—O,) hydrochloric acid =Mu0+HO, and, as already 
mentioned, the peroxyd of barium =Ba0+(+0,) that of hydro- : 
gen —HO+(+0,) and the peroxyd of manganese =MnO+_ 
(—O). Proceeding from these suppositions, it is very easy to 
account for the different way in which the two sets of peroxyds 
are acted upon by muriatic acid. 7 
From reasons as yet entirely unknown to us, HO can be 
chemically associated only with +0, and with no other modifi. 
cation of oxygen, to constitute what is called the peroxyd of 
hydrogen ; and in a similar way MuO (the hypothetically anby- 
drous muriatic acid of older times) is capable of being united 
only to —O to form the so-called chlorine, which I denominate 
peroxyd of murium. If we cause Mu0+HO to react upo? 
BaO+(+0,) MuO unites with BaO, and HO with +0; but # 
As you will easily perceive, r 
that, under proper circumstances, two opposite peroxyds, pe 
being intimately mixed together and in the right proportion ane 
ac bi a7 by muriatic acid, could yield neither ddevits not 
baryta and protoxyd of manganese, the active oxygen. of bo 
