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Researches respecting the radical of Benzow Acid. 283 
and alcohol gave the same result and consequently confirmed the at- 
om of water of crystallization found in my first analysis. 
I herewith transmit the result of an analysis made in 1813 of sub- 
limed benzoic acid, which [ ignited in a tube with chlorate of potas- 
sa and chloride of potassium. 
After this method 0:335 gm. of the acid yielded 0°138 gm. water 
and 0-855 of carbonic acid, which gives in one hundred parts ; 
Carbon, - - - 68°85 
Hydrogen, ~ - - 4:99 
Oxygen, - - - 26°66 
These numbers agree exactly with the composition of the hydra- 
tediacidn@ a2 /Ei42 Os. . 
In vain did I endeavor to separate water from the benzoic acid, by 
saturating the crystallized acid with a given quantity of oxide of 
lead, and therefore could not infer tne presence of water of crystalli- 
zation ; this analysis farther gave four atoms of oxygen, although I 
had previously found by analysis of the salt of lead that the acid in it 
saturated three times as much of the oxide as in the neutral benzoate, 
I was therefore induced since the results did not correspond, to re- 
ject this analysis of the crystallized acid. 
I next ignited given quantities of the neutral benzoate of lead, 
after endeavoring to free the same from water of crystallization 
by fusion. 
Each analysed quantity of the salt was produced by itself; I have 
always followed the same principle, because a fault in one single op- 
eration may become a constant fault in every analysis; I therefore 
fused each portion of the salt by itself and always obtained varying 
results; the cause of which difference I believed must be ascribed to 
to the volatilization of undecomposed benzoic acid. Upon now 
comparing the results of these analyses it is evident that different 
quantities of water still remained in the fused salt. 
In order to prevent the volatilizing of the acid I employed the 
salt of lead ; this is the analysis | have described. The result cal- 
culated from the corrected atomic weight and compared with your 
analysis is as follows ; 
Result of the former. Result of the correct analysis. 
Carbon, - - 15°'405 4 =. - 
Hydrogen, - - 4951 - = 4°356 
Oxygen, - - 19644 - - 20°941 
Vou. XXVI.—WNo. 2. 37 
