388 G. F. Barker on normal and derived Acids. 
many intermediate acids as successive abstractions of H,O from 
the normal acids, will permit. Thus, chlorine may yield 
Monad. Triad. Pentad. Heptad. 
Ortho, HClO 4H,ClO, 4H,ClO, H,Cl0,. 
Mono-nieta, sacks H Clo, H,Clo, H,Cl0,. 
Di-meta, vias cies H C10, H,Cl0, 
Tri-meta, C10, 
erived from these by the loss of the elements of water. 
Tt is plain then, that the equivalence of the radical is the same 
both in the normal acids and in those derived from them ; and 
at they differ in the fact that in the former all the bonds are 
united to hydryl, while in the latter some of them are see? 
ted by oxygen. This is very clearly represented by the grap 
method. fn the passage from ortho-sulphuric acid H, 0, 
the negative oxyd SO,, we have 
HO OH HO 0 OH () 
8 Era ar if 0 
0—S—oH S HO—S—OH soe 
ao go r = 
~HO--. OF 0 OH ts) 
and in the case of phosphoric acid— 
faa Tf F 0 i 
HO” ‘oH d § 0 
se] 
where finally, two molecules together losing H,O, form phos 
pone NS fs Pe tr eit be vctana Bat the tribasic acid, 
oe i by | i : tk . horic cea . really mono-meta- eas | 
Phosphoric acid; pet rt orm is a di-meta-acid. 
