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GENERAL OBSERVATIONS. 



Acids. 



9. The acids are all compound bodies. They 

 may, with reference to their atomic weights, be 

 divided into three classes: 1. Combinations of 

 a simple acidifiable or intermediate combustible 

 with oxygen. 2. Acids, consisting of oxygen 

 united to two bases at once, or undecomposed 

 acids. 3. Hydracids, consisting of a simple or 

 compound supporter united to an atom of hydro- 

 gen. The following table exhibits the atomic 

 weights of all these acids : 



1. OXYGEN UNITED TO A SINGLE BASE. 



