author is placed, who writes upon a popular subject, under the cir- 

 cumstances which apply to my public character. Nor can I help 

 indulging a reasonable expectation, that the rapid advance and general 

 dissemination of chemical knowledge, of late years, amongst the 

 higher and middle classes of fiociety, will shield me^ in some degree 

 at least, from the charge of having blended too much reasoning 

 drawn from this source, with the body of the work. Such as it is, I 

 submit the work to the tribunal of public opinion. > ^^^^^^ b. 

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