[ i64 ] 



Acids of fnch ftrength I have therefore denominated real, as either 

 containing ro water or containing only; as much as is neceffary to 

 their effential compofition, as far as this is at prefent known. The 

 method of transforming the expreffion Jlandard into that of real, 

 I have there alfo given p. 67, and by it have formed the table I 

 here prefent ; this latter expreffion I therefore now employ in every 

 cafe inftead of that ol Jlandard, together with the fubftitution of 

 a more commodious expreffion of the ftrength of acids : The defign 

 of this paper is alfo to exhibit an illuftration or amendment of 

 feveral of the determinations contained in my laft, which being 

 for the moft part fingle, required confirmation by fliewing their 

 agreement with the experiments of feveral of the moft eminent 

 chymifts made fince the publication of mine, that is fince the year 

 1791, with a few made nearly at the fame time. In my former 

 paper I compared my refults with thofe of Bergman and Wenzel, 

 they being almoft the only perfons who had made this fubjed the 

 principal objed of their enquiry, and had purfued it to a con- 

 siderable extent ; in each particular inftance I have traced the 

 reafon of the difference of their refults from my own when it was 

 fuch as to dcferve notice, and I fhall not here repeat what I have 

 there faid ; but I cannot avoid again mentioning one general fource 

 of error attending the mode of inveftigation adopted by both and 

 yet noticed by neither, namely the lofs that many neutral falts 

 undergo dering evaporation, a lofs whofe difcovery is of con- 

 fiderable importance, not only to the prefent inquiry, but alfo to 



the 



