New Pulllcathns . %6() 



turbid, Is regarded by Dr. Gren as the bafis of aqueous va, 

 pour entirely deprived of its caloric. 



Dr. Gren regards that which has been called the oxygen^ 

 ated muriatic acid, as being nothing but the proper muriatic 

 acid in its full energy. To that which is now commonly called 

 ihz muriatic acid, he gives iha inrnQ o^ muriatous acid; re- 

 garding it as analogous in its charader to the fulphureous 

 and the nitrous acids. 



He rejefts, after DoerfTurd, the peculiar exiftence of the 

 camphoric acid. He confiders the narcotic matter of certain 

 vegetables as worthy to be cUftinguiflied as one of their pe- 

 culiar immediate principles. 



The lifhic acid does not appear to this author to be one 

 that is formed by the organic funtlions of animals. 



He affirms, that thofe wliich are called the acetous and the 

 acetic acids differ only in the degrees of their concentration, 

 not in the proportions of their principles. 



His general account of the acids, alkalies, and earths, is 

 indeed brief, and rather incomplete, but in almoft every par- 

 ticular fufficiently correft. 



According to our pnjonal experience, hot lime and fulphur, 

 coming into intimate contatl, are apt to exhibit a combuf- 

 tion of the fulphur, from which enfues a formation of ful- 

 phureous acid. Dr. Gren recommends, to prepare fulphuret 

 of lime by mixing chalk with fulphur, and then igniting the 

 mixture, to expel the carbonic acid ! 



In his account of vegetables, Dr. Gren relates, contrary to 

 the experience of other chemilts, that pyro-Ugneous acid, when 

 fufficiently pure, is, in the nature and proportions of its prin- 

 ciples, precifely the fame whh .acetic acid ! 



He afcrihes to the mechanical porofity alone, of charcoal, 

 imaffifled by anv chemical re- agency, that power of purifying 

 faline leys from colouring matters which charcoal is well 

 known to poffefs. 



From accurate analyfes of wheat, able chemids have re- 

 £r)lved this fuhflance into the two immediate principles of 

 farina and gluten; but Dr. Gren rather confiders it as com- 

 pofed of gluten, Jlarch, and vtucilagc. 



lie denies that any vegetables have in thqm fuch an im-r 



mediate 



