266 
ON AQUA REGIA. 
duced ; by the analogy of constitution of several chlorides of 
compound radicals, destitute of oxygen, and of the oxides 
of similar radicals • by that of the indenigen and indenoxide ; 
by the various stages of oxidation of isaten, &c. ; by the 
action of sulphuretted hydrogen on the nitrites of naphtha- 
lin and protoxide of benzin, of which are produced the 
amidures of the radicals ; of these bases are produced — 
(C 20 H 14 O+N)+6H 2 S = (C 1 WAd)4-4H_+6S, (C 12 H 10 O+N) 
+ 6H 2 S=(C i2 H 10 +Ad) 4H+6S. Finally, it is known to 
chemists that the constitution of the combinations formed 
by kakodyl, was understood by the illustrious Swedish 
chemist, at the time, when similar combinations were con- 
sidered as composed in a manner totally different from that 
now believed to be the true one; induced by which circum- 
stances the celebrated Bunsen attempted to isolate this 
radical. 
34. Great, however, as the number of facts be, apparent- 
ly warranting the truth of the hypothesis in question, it 
may, perhaps, not hold good in all cases, as it starts from a 
principle admitted in organic chemistry, viz., that each 
oxygen combination of the first order is an oxide of a 
radical, a principle found to be incorrect with reference to 
Wo, Ur, Cr, (KCr+Cr,) S, (S+S,) 
and in many others* Notwithstanding, therefore, the 
most plausible analogies, Berzelius, not to be contradicted 
by his own hypothesis, considered these bodies as combi- 
nations of the third and second order. The combination of 
H. Rose, for instance, is, according to the Swedish chemist, 
composed of sulphuric acid, and chloro-sulphuric acid. 
3(S+S) = S+5S. 
And Peligot's salt would consist of 
(KCr+Cr)=(K+2Cr.) 
With reference to Pelouze's acid, it might have been 
* The sign 7 means one equiv. of chlorine. 
