G. F. Barker on normal and derived Acids. 397 
a chlorhydrine by exchanging its hydryl (HO) for the monad 
chlorine (from which fact the word chlorhydrine comes) it is evi- 
dent that there may be as many chlorhydrines obtained from a 
given ortho or meta acid, as is equal to the number of atoms of 
its basic hydrogen, less one, the final product being the chlorid 
of the radical, Thus with ortho-silicic acid, there may 
Hydric silicate. Mono-chlorhydrine. Di-chlorhydrine. Tri-chlorhydrine. _Silicie chlorid. 
5 Ch ol Cl 
cl 
Per l | 
HO—Si—OH i i—OH sul ian HO—Si—Cl an 
d d 
Dichlor- Di-hydro- Mono-hydro- 
Acid. Mono- H 
chlorhydrine. hydrine. ehlorhydrine. hydrine. hydrine. 
A comparison of these formulas with those of hypophospho- 
rous and phosphorous acids on page 392, will make clear the - 
relation of these acids to mono-meta-phosphoric acid, by showing 
that they are its hydro-hydrines, the last of the series, H,PO 
phosphoric aldehyd, not being yet known. : 
The results given in the foregoing pages may be briefly re- 
capitulated. I have attempted to show: 
1. That all the bonds of any simple radical may be saturated 
by the monad hydryl. . 
2. That the compounds th 
: ve 
‘Several stages, while that of positive rarely changes. An¢ 
4 hence, that there may be a savin bE ortho acids from a given — 
e 
mal or ortho acid, a derived acid is produced, which may be 
| indicated by the prefix meta. 
.® This Journal, IJ, xliii, 155, March, 1867. 
