COMBUSTIBLE ACIDS. 



together, compared to the stability of oxalic 

 acid, renders it probable, that the secondary 

 constituents of the two acids are very differ- 

 ent. 



3. Dr. Gobel has given us another analysis of 

 this acid, by means of peroxide of copper. He 

 analyzed formate of lead, and found it a com- 

 pound of 



Formic acid . . 4-5693 



Protoxide of lead . 1 4-0744 

 Water 1-1063 



19-75* 



Doubtless the true numbers are 



1 atom formic acid . 4-625 



I atom protoxide of lead 14-000 

 1 atom water . . 1-125 



19-75 



He analyzed 10 grains of the formate of lead 

 by heating it with peroxide of copper in a glass 

 tube. His description of the result of the ana- 

 lysis is not very clear, and it seems to contain 

 some arithmetical slips. When these are correct- 

 ed (supposing the formate of lead used anhy- 

 drous) the constituents obtained were the fol- 

 lowing : 



* Annals of Philosophy, (second serie^) III. 4G3. 



